Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Application Note

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1 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Application Note February

2 Disclaimer The information contained in this publication is subject to change without notice. VERITAS Software Corporation makes no warranty of any kind with regard to this manual, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. VERITAS Software Corporation shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this manual. Copyright Copyright VERITAS Software Corporation. All Rights Reserved. VERITAS, VERITAS SOFTWARE, the VERITAS logo, Business Without Interruption, VERITAS The Data Availability Company, and VERITAS Cluster Server are trademarks or registered trademarks of VERITAS Software Corporation in the USA and/or other countries. Other product names mentioned herein may be trademarks or registered trademarks of their respective companies. VERITAS Software Corporation 350 Ellis Street Mountain View, CA USA Phone Fax

3 Contents Preface v Technical Support v Conventions vi Chapter 1. Introduction Background Information What is a Disaster Recovery Solution? Why Implement a Disaster Recovery Solution? What Needs to be Protected in a SQL Server Environment? How Can VVR help with Disaster Recovery in a SQL Server Environment? Modes of Replication Typical Disaster Recovery Configuration for a Stand-Alone SQL Server Typical Disaster Recovery Configuration for SQL Server in an MSCS Environment Chapter 2. DR Solution for a Stand-Alone SQL Server Prerequisites Software Requirements Hardware Requirements Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Setting Up the Secondary Host Setting Up the Primary Host Setting Up the Replication Normal Operating Procedures iii

4 Disaster Recovery Operations Chapter 3. DR Solution for SQL Server with MSCS Prerequisites Software Requirements Hardware Requirements Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment Setting Up the Secondary Host Setting Up the Primary Host Setting Up the Replication Normal Operating Procedures Disaster Recovery Operations Chapter 4. Other Recommendations Secure Link Additional Monitoring Performance Tuning SQL Server in an MSCS Environment Chapter 5. Known Issues and Troubleshooting Know Issues and Limitations Troubleshooting Delayed Write Failure of Cluster Group in Virtual SQL Server Index iv Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

5 Preface This document provides information on implementing a disaster recovery solution for SQL Server using VERITAS Volume Replicator 3.0 (VVR). If this document is dated more than six months prior to the date you are installing your applications, contact VERITAS Technical Support to confirm you have the latest supported versions of the applications and operating system. Technical Support U.S. and Canada: call To access Fast Code, enter 100 during the introductory message. Europe, the Middle East, or Asia: visit the Technical Support Web site at for a list of each country s contact information. Software updates, TechNotes, product alerts, and hardware compatibility lists, are also available from To learn more about VERITAS and what we offer, visit v

6 Conventions Conventions Typeface/Font bold italic Courier Courier (bold) Courier (bold, italic) Symbol C:\> Usage names of screens, windows, tabs, dialog boxes, options, buttons new terms, book titles, emphasis, variables in tables or body text computer output, command references within text command-line user input, keywords in grammar syntax variables in a command Usage command prompt vi Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

7 Introduction 1 This document provides information on implementing a disaster recovery solution for SQL Server using VERITAS Volume Replicator 3.0 (VVR). The following sections are covered in this document: Background information on disaster recovery Implementing the disaster recovery solution Setting up the disaster recovery solution Understanding known issues and limitations Troubleshooting Background Information To learn more information about this disaster recovery solution, why you should implement a disaster recovery plan, and how VVR can help, refer to the sections below. What is a Disaster Recovery Solution? A disaster recovery (DR) solution is a series of procedures you can use to safely and efficiently restore application data and services in the event of a catastrophic failure. A typical disaster recovery solution requires that you have a Primary and Secondary host. The Primary host provides data and services during normal operation, and a Secondary host provides data and services in an event the Primary host fails. 1

8 Background Information The illustration below demonstrates an environment that is prepared for disaster recovery using a disaster recovery solution. In this case, the Primary host is replicating its application data to the Secondary host. When a failure occurs, such as an earthquake that destroys the data center in which the Primary host resides, the disaster recovery solution is implemented. The data that was replicated to the Secondary host is used to restore the application services to clients. 2 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

9 Background Information Why Implement a Disaster Recovery Solution? A disaster recovery solution is vital for businesses that rely on the availability of their data. A well-designed disaster recovery solution prepares a business for unexpected disasters and provides the following benefits in a disaster recovery situation: Minimizes economic loss due to the unavailability or loss of data. Ensures safe and efficient recovery of data and services. Minimizes any decision making during the disaster recovery. Reduces the reliance on key individuals. Strategically planning a disaster recovery solution provides businesses with affordable ways to meet their service level agreements, comply with government regulations, and minimize their business risk. What Needs to be Protected in a SQL Server Environment? There are several different components that need to be protected in a SQL Server environment. Refer to the sections below for descriptions on these components. User Databases: The most critical component in any SQL Server implementation is the user data that is stored in user databases. Loss of data stored in the user database is the single most catastrophic possibility of a disaster. Logins: Logins allow clients to connect to SQL Server and execute queries on user data. Logins are stored in the master database and each of the user databases. Jobs: Jobs are a set of tasks that are executed on a scheduled to maintain SQL Server databases. The job configuration is stored in the msdb system database. Alerts: Alerts are actions that are taken when a specific event occurs. They are used to respond to and correct errors that occur in SQL Server. The alert configuration is stored in the msdb system database. Operators: Operators are contacts that address problems occurring in SQL Server. They are notified in the event of errors. The operator configuration is stored in the msdb system database. Extended Stored Procedures: Extended stored procedures are external routines that are called from within SQL Server. They are typically stored in DLLs files on the file system. Other Server Extensions: SQL Server is a very flexible database engine and it is possible to extend its functionality in several ways. These extensions are also important to the operation of the SQL Server. Chapter 1, Introduction 3

10 Background Information How Can VVR help with Disaster Recovery in a SQL Server Environment? While many of the components described above are replicated at the disaster recovery site through conventional means, VVR solves the difficult problem of replicating the user database. Refer to the following information on how VVR helps with disaster recovery in a SQL Server environment: Write Order Fidelity: VVR guarantees that changes made to data on the Primary host are made in the same sequence on the Secondary host. This ensures the data remains in a consistent state in the event of a disaster. Synchronous Replication: VVR guarantees that changes committed on the Primary host are committed on the Secondary host first. This ensures the data on the Secondary host matches the data on the Primary host and minimizes data loss in the event of a disaster. Volume Snapshot: Volume Manager, the volume management technology used by VVR, provides the ability to take a point-in-time snapshot of a volume. This allows you to verify the consistency of the data on the Secondary host without impacting the replication between the Primary and Secondary host. A volume snapshot is also used to execute offline backups without impacting SQL Server s performance. Heterogeneous Storage Support: VVR provides a replication technology that works with the heterogeneous storage hardware. This allows for maximum use of existing hardware and provides flexibility when adding new hardware to a SAN. 4 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

11 Background Information Modes of Replication VVR 3.0 replicates in synchronous, asynchronous, and soft-synchronous modes. It is recommended that you replicate using soft-synchronous mode for SQL Server. However, depending on the specific requirements of desired performance and acceptable latency in replication, synchronous or asynchronous modes are also acceptable. The following sections provides a brief description of the differences between the modes of replication: Synchronous Replication Synchronous replication ensures that an update has been posted to the Secondary host and acknowledged to the Primary host before completing the update at the Primary host. This mode of replication is most effective in application environments with low update rates that need the hosts to always reflect the same data. Asynchronous Replication Under asynchronous replication, while application updates are immediately reflected at the Primary host, they are persistently queued to be forwarded to the Secondary host. This allows asynchronous replication to deal with temporary outages of the network or Secondary host without affecting the performance of the application. Soft-Synchronous Replication Soft-synchronous replication is synchronous under normal circumstances, but converts to asynchronous during a temporary outage. After the outage passes and the Secondary host catches up, replication coverts to synchronous. Note Refer to the VERITAS Volume Replicator 3.0 User s Guide for additional information. Chapter 1, Introduction 5

12 Background Information Typical Disaster Recovery Configuration for a Stand-Alone SQL Server The illustration below shows the details of a typical configuration used to protect SQL Server in the event of a disaster. In this configuration, the Primary and Secondary hosts are configured similarly as described below. Primary Host Configuration SQL Server is installed and online. SQL Server has its system and user databases attached. SQL Server program files and system database files are stored on one volume. User database log files are stored on a mirrored volume. User database data files are stored on a striped volume. The user database volumes form a replicated volume group (RVG) that is replicating to the Secondary host. 6 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

13 Background Information Secondary Host Configuration SQL Server is installed and online. SQL Server only has its system databases attached. SQL Server program files and system database files are stored on one volume. User database log files are stored on a mirrored volume. User database data files are stored on a striped volume. The user database volumes form a replicated volume group that is receiving replicated data from the Primary host. Refer to section Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server for information and procedures for setting up and configuring in a stand-alone SQL Server environment. Typical Disaster Recovery Configuration for SQL Server in an MSCS Environment The illustration below shows the details of a typical configuration used to protect SQL Server in a MSCS environment in the event of a disaster Chapter 1, Introduction 7

14 Background Information Primary Host Configuration MSCS cluster is installed and online. Virtual SQL Server is installed using the shared disk volumes for system database files and program files on local non-shared volumes. Virtual SQL Server has its system and user databases attached. User database log files are stored on a mirrored volume created over a set of shared disks. User database data files are stored on a striped volume created over a set of shared disks. The user database volumes form a replicated volume group (RVG) that is receiving replicated data from the Primary host. The RLink of the RVG is using the IP address of the Virtual SQL Server. The Virtual SQL Server resource in MSCS has dependencies over the RVG resource and the shared disk resource containing the system databases. The RVG resource has dependencies over disk group and resource and network name of the Virtual SQL Server. Secondary Host Configuration MSCS cluster is installed and online. Virtual SQL Server is installed using the shared disk volumes for system database files and program files on local non-shared volumes. Virtual SQL Server only has its system databases attached. User database log files are stored on a mirrored volume created over a set of shared disks. User database data files are stored on a striped volume created over a set of shared disks. The user database volumes form a RVG that is receiving replicated data from the Primary host. The RLink of the RVG is using the IP address of the Virtual SQL Server. 8 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

15 Background Information The Virtual SQL Server resource in MSCS has dependencies over the RVG resource and the shared disk resource containing the system databases. The RVG resource has dependencies over disk group and resource and network name of the Virtual SQL Server. Note It is also possible to use a different IP address and network name pair for replicated volume group RLinks. If a different IP address and network name pairs are used, the dependencies will change accordingly. Refer to section Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment for information and procedures for setting up and configuring in an MSCS environment. Chapter 1, Introduction 9

16 Background Information 10 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

17 DR Solution for a Stand-Alone SQL Server 2 This chapter provides the following information on implementing a disaster recovery solution of a stand-alone SQL Server database: Prerequisites Setting up and configuring the DR solution for a stand-alone SQL Server Normal operating procedures Disaster recovery operation Prerequisites To implement a disaster recovery solution you must designate a Primary host and a Secondary host. Each host must be configured similarly. The following sections provide details with respect to which software versions are supported. Note It is recommended that you should not configure VVR 3.0 using more than one Secondary host. VVR 3.0 Primary migration and takeover operations for failover currently supports a single VVR Secondary host. Software Requirements Operating Systems Microsoft Windows 2000 Server, Advanced Server, with Service Pack 2 or above Microsoft Windows 2000 DataCenter Server, with Service Pack 1 Note VVR 3.0 is not supported on Microsoft Windows 2000 Professional or Microsoft Windows XP. 11

18 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Replication Software VERITAS Volume Manager 3.0 VERITAS Volume Replicator 3.0 Applications Microsoft SQL Server 2000 Standard or Enterprise Edition Microsoft SQL Server 7.0 Standard or Enterprise Edition Hardware Requirements You will need two systems (Primary and Secondary) with the following configurations: Pentium 200 MHz or higher Hard drive with 70 MB for Volume Manager, 5 MB for VERITAS Volume Replicator 3.0, and 250MB for typical installation of SQL Server 2000 Enterprise Edition or 170 MB for typical installation of SQL Server 7.0 Enterprise Edition. 128 MB or more of system memory 800 x 600 pixels or higher monitor resolution Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Setting up VVR and SQL Server involves several tasks. Refer to the sections below for information on the following sections: Setting up the Secondary host Setting up the Primary host Setting up the replication 12 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

19 Setting Up the Secondary Host Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Make sure the SQL Server configuration on the VVR Secondary host is identical to the SQL Server configuration on the VVR Primary host. If SQL Server on the Secondary host is already installed, make sure you change the configuration to make it the same when you set up SQL Server on the VVR Primary host. You should align the configuration before attempting to attach the replicated database in case of failover due to migration or disaster. Installing and Configuring a New SQL Server Setup to Use VVR for Replication Refer to the following procedures for information on creating a new SQL Server setup to use for VVR replication on the Secondary host. The following procedures are recommended for installing SQL Server, Volume Manager, and VERITAS Volume Replicator on the Secondary host. To install the software 1. Install Volume Manager and VERITAS Volume Replicator. Refer to the Volume Manager user s guides for installation procedures. 2. Install SQL Server. Make sure the setup options are identical for SQL Servers on both the Primary and Secondary hosts. Refer to the Books Online for installation procedures. To create the volumes 1. Start the VERITAS Volume Manager Console and connect to the Secondary host. Use the host name/ip address of the NIC card used by VVR. Note: VVR uses the name of the connected host to create VVR objects, such as RLink. 2. Create a Dynamic Disk Group on the Secondary host using the New Disk Group wizard. 3. Create volumes in that disk group on the Secondary host using the New Volume wizard. Note: Make sure the Replicated Volumes are the same size on the Primary and Secondary hosts before setting up and configuring your disaster recovery solutions. Chapter 2, DR Solution for a Stand-Alone SQL Server 13

20 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Setting Up the Primary Host Make sure the SQL Server configuration on the VVR Primary host is identical to the SQL Server configuration on the VVR Secondary host.the following sections give procedures on installing and configuring a new SQL Server setup using VVR replication and installing and configuring an existing SQL Server setup using VVR replication. Installing and Configuring a New SQL Server Setup to Use VVR for Replication Refer to the following procedures for information on creating a new SQL Server setup to use for VVR replication on the Primary host. The following procedures are recommended for installing SQL Server, Volume Manager, and VERITAS Volume Replicator on the Primary host. To install the software 1. Install Volume Manager and VERITAS Volume Replicator. Refer to the Volume Manager user s guides for installation procedures. 2. Install SQL Server. Make sure the setup options are identical for SQL Servers on the VVR Primary and Secondary hosts. Refer to SQL Server Books Online for installation procedures. To create volumes if you have no user database set up 1. Start the VERITAS Volume Manager Console and connect to the Primary host. Use the host name/ip address of the NIC card used by VVR. Note: VVR uses the name of the connected host to create VVR objects, such as RLink. 2. Create a Dynamic Disk Group on the Primary host using the New Disk Group wizard. 3. Create volumes in that disk group on the Primary host using the New Volume wizard. Note: Make sure the Replicated Volumes are the same size on the Primary and Secondary hosts before setting up and configuring your disaster recovery solutions. 14 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

21 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server To create volumes if you have a user database on a basic drive and you want to migrate it to a Volume Manager volume 1. Detach the user database using the sp_detach_db procedure. 2. Start the VERITAS Volume Manager Console and connect to the Primary host. Use the host name/ip address of the NIC card used by VVR. Note: VVR uses the name of the connected host to create VVR objects, such as RLink. 3. Create a Dynamic Disk Group on the Primary host using the New Disk Group wizard. 4. Create volumes in that disk group on the Primary host using the New Volume wizard. Note: Make sure the Replicated Volumes are the same size on the Primary and Secondary hosts before setting up and configuring your disaster recovery solutions. To upgrade the volume from a basic disk to a Volume Manager volume 1. Detach the user database using the sp_detach_db procedure. 2. Upgrade the volume. Refer to the Volume Manager User s Guide for procedures on upgrading the volume. Chapter 2, DR Solution for a Stand-Alone SQL Server 15

22 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Setting Up the Replication Follow the procedures below to set up replication between the Primary and Secondary hosts. When setting up the replication make sure the volumes have the same name on each node. You will also need a third volume for your log and Replicated Volume Group (RVG). You also need to have the same name on both nodes for the disk groups. Note Make sure that the Secondary host is attached and both Primary and Secondary RVG s are started before you perform the database operations. To set up the Replicated Volume Groups (RVG) and the Replicated Data Sets (RDS) Before you begin the procedures of setting up the replication, make sure the RVG and RDS are properly configured. Follow the procedures below to set up the RVG and RDS. 1. Connect the Primary and Secondary hosts. From the Volume Manager screen, select File>Connect. 2. Enter the Primary host name and click OK. 3. Right-click the Replication Network and select Setup Replicated Data Set. 4. From the Replicated Data Set wizard Welcome screen and click Next. 5. Enter the Dynamic Group name from the drop-down menu and check the volumes that are part of the RDS. 6. Select the Replicator Log from the drop-down menu and click Next. 7. From the next screen, select the Secondary host and click Next. 8. Review the volume information and click Next. 9. Clear the Start Replication on Primary, Start Replication for Secondary, and Attach for Secondary check boxes and click Next. 10. Review the information on the Summary screen click Next. 11. Click Finish to complete setting up the RVG and RDS. 16 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

23 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server To attach the Secondary host 1. From the Volume Manager screen, right-click the Secondary RVG and select Attach Secondary. 2. If you are attaching the Secondary host with no user databases, select the None option. If you are attaching the Secondary host with upgraded volumes, select the Autosync option. If you are attaching the Secondary host with migrated data, select the Force option. 3. Click OK. To start the Secondary host Right-click the Secondary RVG and select Start Replicated Volume Group. This starts the Secondary RVG. To start the Primary host Right-click the Primary RVG and select Start Replicated Volume Group. This starts the Primary RVG. To mount the drive on the Primary host Before completing the replication you need to mount the drive on the Primary host. If you are using migrated data, make sure to copy the data to the drive and attach the database. Chapter 2, DR Solution for a Stand-Alone SQL Server 17

24 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Normal Operating Procedures Adding a New User Database The key component of this disaster recovery solution is the data contained in the user database files. VVR replicates changes to the data contained in these files to a Secondary SQL Server. Refer to the following when adding a new user database to SQL Server: Place all of the user database files on volumes in the Replicated Volume Group. Place all of the user database log files on the appropriate volumes in the Replicated Volume Group. This ensures the user database is replicated consistently to the Secondary SQL Server. Maintaining Consistency Between the Primary and Secondary Hosts User database files are the only files that are replicated using this disaster recovery solution. This prevents inconsistencies among system databases when the migration takes place. However, this requires that some components of the SQL Server are kept consistent between the Primary and Secondary hosts. SQL Server Login Considerations In case of a disaster or controlled failover, the Secondary host takes over as the Primary host providing replicated databases. The login SIDs in the SQL Server databases should match with the SID of the logged-on user to the failed over SQL Server. This can be done in one of the following ways: Microsoft Windows Authentication Mode When SQL Server is configured with Microsoft Windows authentication mode, only the Microsoft Windows domain level logins should be used. Such logins ensure the availability of proper user accounts within a domain or across trusted domain. Domain accounts that are allowed can be: - In the same domain - In domains that share a trust - In domains that are trusting through an indirect transitive trust Considering the possibility of a failover with Microsoft Windows authentication logins, do not use local user logins to connect to SQL Server. The same is true if accounts with the same login name and password are configured on both he hosts. Each host has unique machine SID, and different SIDs for logins. 18 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

25 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Mixed Authentication Mode Make sure the SQL Server logins and the login SID created on each SQL Server are identical. SQL server accepts the provided SID while creating the SQL logins. Identical SQL Server logins on the Secondary host should be available before attaching the database in case of failover. Note When using mixed authentication mode with Microsoft Windows login, the constraints of Microsoft Windows authentication are applicable. Additional Considerations In addition to logins, other components must be maintained on both the Primary and Secondary hosts. They must be maintained consistently to ensure a successful disaster recovery. Refer to the following components: Jobs Alerts Operators Extended stored procedures Other server extensions Monitoring the Status of the Replication Under normal operating procedures you want to monitor the status of the replication. Refer to the information below for two different ways of monitoring the status of replication. Using the GUI to monitor the status 1. From the Volume Manager screen, select Actions>Monitor View. 2. Review the status icons for information about the replication. For additional information refer to the VERITAS Volume Replicator User s Guide. Using alerts and actions to monitor the status Alerts are actions that are taken when a specific event occurs. They are used to respond to and correct errors that occur in SQL Server and you can view them in the GUI. Actions are used to send s or invoke any command upon an occurrence of the event configured. Chapter 2, DR Solution for a Stand-Alone SQL Server 19

26 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Migrating SQL Server to the Secondary Host For maintenance purposes, you may want to migrate SQL Server to the Secondary host. Follow the procedures below to migrate SQL Server to the Secondary host. To detach the user database You must detach the user database before migrating SQL Server to the Secondary host. Use the sp_detach_db procedure to detach the user database. To un-mount the user database drives Before migrating SQL Server to the Secondary host, un-mount the database files and logs on the Secondary host. To migrate SQL Server to the Secondary host 1. From the Volume Manager screen, right-click the Primary RVG and select Migrate. 2. Select the Secondary host and click OK. The replication role migrated to the Secondary host. To attach and start the Secondary host 1. From the Volume Manager screen, right-click the Secondary RVG and select Attach Secondary. 2. Select the Force option and click OK. 3. Right-click the Secondary RVG and select Start Replicated Volume Group. This starts the Secondary RVG. 4. Right-click the Primary RVG and select Start Replicated Volume Group. This starts the Primary RVG. To mount the user database drives Before attaching the user database, mount the volumes containing the database files and logs on the Secondary host. To attach the user database When you complete migrating SQL Server to the Secondary host, attach the user database. Use the sp_attach_db procedure to attach the user database. 20 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

27 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Testing the Readiness of the Secondary Host Under normal operating procedures you will want to periodically test the readiness of the Secondary host. Follow the procedures below to create a snapshot and test the readiness of the Secondary host. Before creating a snapshot to test the readiness of the Secondary host, you may need to take a SQL Server database checkpoint for the database you are using for the Primary host. This ensures that all modifications to the data and log pages are guaranteed to be written to the disk. Stopping SQL Server on the Primary host also ensures that a checkpoint is taken for each database. However, in case of a disaster, it may not be possible to take checkpoints. When simulating a disaster, explicitly taking checkpoints is not desired. In this case, after the takeover on the Secondary host, SQL Server will recover the databases and rollback all incomplete transactions in the log. Note Be sure to have an additional drive configured to create the snapshot. 1. From the Secondary host, select the drive you want to create a snapshot. 2. Right-click the drive and select Snap>Snap Start. 3. Select the appropriate configurations for your drive and click OK. 4. When the mirror is complete, right-click the same drive and select Snap>Snap Shot. 5. Assign a drive letter and click OK. 6. Attach the database using the sp_attach_db procedure. 7. Run a verification test on the database. Use procedures appropriate for your configuration. 8. Detach the database using the sp_detach_db procedure. 9. Right-click the same drive and select Snap>Snap Back. 10. Select Resynchronize with Original Volume and click OK. 11. If you no longer need the snapshot and want to recover drive space, right-click the drive and select Snap>Snap Abort. This deletes the snapshot. Chapter 2, DR Solution for a Stand-Alone SQL Server 21

28 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Applying Service Packs Applying Service Packs to the Operating System The Microsoft Windows service pack comes with a setup wizard that guides you through installing and uninstalling the service pack. It is recommended that you only install the service pack when there is a specific requirement. It is also recommended that you keep the uninstall option open when installing the service pack. This allows you to restore back altered functionality if needed. Applying Service Packs to SQL Server It is recommended that you install the SQL Server service pack to the Primary host first and then the Secondary host. Applying service packs for SQL Server does not affect any VVR functionality; however, you should observe all the recommendations that come with SQL Server service packs. Disaster Recovery Operations This section provides information on bringing up SQL Server on the Secondary host in the event of a disaster. This section also explains how to migrate the role of the Secondary host back to the original Primary host once it is in a good state after a disaster. Bringing Up SQL Server on the Secondary Host To bring up SQL Server using the VVR GUI console 1. From the left-pane in the VVR GUI console on the Secondary host, right-click on the desired secondary RVG node inside the replication network. 2. Select Takeover and follow the instructions in the wizard to perform the takeover operation. Note: The VVR GUI enables the takover command only when the Primary host is unavailable through the network. 3. Mount the volumes. 4. Attach the user database using the sp_attach_db procedure. 22 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

29 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server To bring up SQL Server using the command line 1. From the command line, enter the following commands: vxrvg stop <replicated volume group name>. vxrlink det <name of rlink for replicated volume group>. vxrvg -r <rvg> dis <volume of the replicator log>. vxrvg set primary=true <rvg>. vxrvg aslog <rvg> <srl-volume>. vxrvg start <rvg>. 2. Mount the volumes. 3. Attach the user database using the sp_attach_db procedure. Restoring the Primary Host Once you migrated the role of the Primary host, you need to restore the Primary host. Note Make sure to attach the Secondary host first and then the Primary host. The attach will not complete until the two RVG s are connected to each other. From the command line, enter the following commands: vxrvg stop <rreplicated volume group name>. vxrlink det <name of rlink for replicated volume group>. vxrvg -r <rvg> dis <volume of the replicator log>. vxrvg set primary=false <rvg>. vxrvg aslog <rvg> <srl-volume>. vxrvg start <rvg>. vxrlink -f -r <rvg> att <rlink>. Run this command on the Primary and Secondary host. Chapter 2, DR Solution for a Stand-Alone SQL Server 23

30 Setting Up and Configuring the DR Solution for a Stand-Alone SQL Server Migrating SQL Server Back to the Original Primary Host Once your original Primary host is in a good state after a disaster, you need to migrate the role of the Secondary host back to the original Primary host. Follow the procedures below to migrate SQL Server back to the original Primary host. To detach the user database You must detach the user database before migrating SQL Server to the Secondary host. Use the sp_detach_db procedure to detach the user database. To un-mount the user database drives Before migrating SQL Server to the Secondary host, un-mount the database files and logs on the Secondary host. To migrate SQL Server to the Secondary host 1. From the Volume Manager screen, right-click the Primary RVG and select Migrate. 2. Select the Secondary host and click OK. The replication role migrated to the Secondary host. To attach and start the Secondary host 1. From the Volume Manager screen, right-click the Secondary RVG and select Attach Secondary. 2. Select the Force option and click OK. 3. Right-click the Secondary RVG and select Start Replicated Volume Group. This starts the Secondary RVG. 4. Right-click the Primary RVG and select Start Replicated Volume Group. This starts the Primary RVG. To mount the user database drives Before attaching the user database, mount the database files and logs on the Secondary host. To attach the user database When you complete migrating SQL Server to the Secondary host, attach the user database. Use the sp_attach_db procedure to attach the user database. 24 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

31 DR Solution for SQL Server with MSCS 3 This chapter provides the following information on implementing a disaster recovery solution of a SQL Server database in an MSCS environment: Prerequisites Setting up and configuring the DR solution for SQL Server in an MSCS environment Normal operating procedures Disaster recovery operation Prerequisites To implement a disaster recovery solution in an MSCS environment either a Primary host, a Secondary host, or both Primary and Secondary hosts are created using a cluster (as a host). However, both Primary and Secondary hosts can not share a same cluster. VVR 3.0, Enterprise Edition with MSCS support, has RVG as a unit of the failover. When a RVG is created and configured for a cluster, the cluster becomes the host of the RVG. For a clustered RVG, the disk-group of that RVG must be a VM 3.0 cluster disk-group. All of the attached RLinks must use the virtual IP address. The virtual IP address and its associated network name must have their resources in the same cluster group of the RVG. When creating a RDS using the VVR console, use the virtual IP address or network name to refer to the host of the RVG. This ensures that the RLinks are created and attached using the proper virtual IP address. For a clustered Primary RVG, connect using the virtual IP address or the associated network name. For a clustered Secondary RVG, provide the virtual IP address or the associated network name for the secondary host in the RDS wizard. When creating RLinks using VVR CLI, you need to provide a virtual IP address or network name. 25

32 Prerequisites After proper configuration, a cluster of the RVG is considered as a host of that RVG. You should configure both of the RVGs (clustered or standalone) similarly. Note It is recommended that you should not configure VVR 3.0, Enterprise Edition with MSCS support, using more than one Secondary host or cluster. VVR 3.0 primary migration and takeover operations for failover currently supports a single VVR Secondary host. Software Requirements Operating Systems Microsoft Windows 2000 Advanced Server with Service Pack 1 or above Microsoft Windows 2000 DataCenter Server Note VVR 3.0 is not supported on Microsoft Windows 2000 Professional or Microsoft Windows XP. Replication Software VERITAS Volume Manager 3.0 Enterprise Edition with MSCS support VERITAS Volume Replicator 3.0 Enterprise Edition with MSCS support Applications Microsoft SQL Server 2000 Enterprise Edition Microsoft SQL Server 7.0 Enterprise Edition 26 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

33 Prerequisites Hardware Requirements You will need MSCS cluster configurations (for Primary and Secondary, or both) and a stand-alone host configuration (if both the Primary and Secondary are not clustered) with the following configurations: Pentium 200 MHz or higher Hard drive with 70 MB for Volume Manager, 5 MB for VERITAS Volume Replicator 3.0, and 250MB for typical installation of SQL Server 2000 Enterprise Edition or 170 MB for typical installation of SQL Server 7.0 Enterprise Edition. 128 MB or more of system memory 800 x 600 pixels or higher monitor resolution The MSCS cluster is based on a Microsoft Windows domain and requires dedicated NICs for its private usage. For detailed MSCS cluster configuration requirements, please refer to Microsoft MSCS documentation. In addition to basic MSCS requirements, the following three sets of shared disks are needed for the cluster setup: The MSCS quorum disk requires one shareable disk with a volume. The Virtual SQL Server requires additional disks for the system databases. VVR 3.0 Enterprise Edition, with MSCS support, requires a set of disks to create clustered disk groups and a RVG using a sub-set of volumes of the disk group. Chapter 3, DR Solution for SQL Server with MSCS 27

34 Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment The Virtual SQL Server in an MSCS environment requires a proper resource dependency tree. With the introduction of the VVR RVG representing replicated clustered volumes, the default dependency set for Virtual SQL Server requires alterations. The RVG RVolumes supports the SQL user databases. With MSCS, the RVG is equivalent to Physical Disk resource which is represents sharable disks/volumes. When configuring SQL Server, the Virtual SQL Server setup allows you to create a SQL system databases on the Physical Disk type resources. Any RVG RVolume cannot have the system databases. However, this does not cause any issues. Replicating the system databases of a SQL server is not required or recommended. After successfully setting up the Virtual SQL Server and creating disk-group and RVG resource instances, the SQL Server resource in MSCS should have dependency over RVG resource (in addition to SQL server name and Physical Disk resource having system databases). The RVG resource should have its dependency over disk-group and network name resources. To alter the dependencies both RVG and disk-group resources should be part of Virtual SQL Server cluster-group. In case of improper dependencies set, the SQL Server fails creating or opening user databases on RVG RVolumes. Apart from this dependency related requirements, SQL Server and VVR is administered as if the virtual server inside the cluster is equivalent to the host (Primary or Secondary) for standalone SQL Server. For VVR RVG, the virtual server name or IP address represents the host. The VVR GUI console is connected to the virtual server residing on any of the cluster nodes. The VVR GUI console connection to virtual server may disconnect during the Virtual SQL Server failover and failback operations. If this occurs, you can re-connect after the failover is complete. The remote SQL clients connected to Virtual SQL Server may disconnect during failover particularly when some SQL database operations are being carried during the failover. In this case, SQL Server rolls back the operations and transactions after the failover is complete. Setting up VVR and SQL Server involves several tasks. Refer to the sections below for information on the following sections: Setting up the Secondary host Setting up the Primary host Setting up the replication 28 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

35 Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment Setting Up the Secondary Host Make sure the virtual SQL Server configuration on the VVR Secondary host is identical to the virtual SQL Server configuration on the VVR Primary host. You should install MSCS and both the virtual SQL Server and the disk group need to be available on the same clustered node. If SQL Server on the Secondary host is already installed, make sure you change the configuration to make it the same when you set up SQL Server on the VVR Primary host. You should align the configuration before attempting to attach the replicated database in case of failover due to migration or disaster. The following sections give procedures on installing and configuring a new SQL Server setup using VVR replication and installing and configuring an existing SQL Server setup using VVR replication. Installing and Configuring a New SQL Server Setup to Use VVR for Replication Refer to the following procedures for information on creating a new SQL Server setup to use for VVR replication on the Secondary host. The following procedures are recommended for installing SQL Server, Volume Manager, and VERITAS Volume Replicator on the Secondary host. To install the software 1. Install Volume Manager and VERITAS Volume Replicator. Refer to the Volume Manager user s guides for installation procedures. 2. Install virtual SQL Server (if your Secondary host is clustered). Make sure the setup options are identical for SQL Servers on both the Primary and Secondary hosts. Refer to the Books Online for installation procedures. - If you are installing virtual SQL Server 7.0, this involves upgrading your existing SQL Server If you are installing virtual SQL Server 2000, you can directly install it without any pre-installation requirements. Chapter 3, DR Solution for SQL Server with MSCS 29

36 Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment To create the volumes 1. Start the VERITAS Volume Manager Console and connect to the Secondary host. Use the host name/ip address of the NIC card used by VVR. Note: VVR uses the name of the connected host to create VVR objects, such as RLink. Use the virtual SQL Server name to connect to the Primary or Secondary cluster. 2. Create a Dynamic Disk Group on the Secondary host (if it is clustered) using the New Disk Group wizard. 3. Create volumes in that disk group on the Secondary host using the New Volume wizard. Note: Make sure the Replicated Volumes are the same size on the Primary and Secondary hosts before setting up and configuring your disaster recovery solutions. Setting Up the Primary Host Make sure the virtual SQL Server configuration on the VVR Primary host is identical to the virtual SQL Server configuration on the VVR Secondary host. You should install MSCS and both the virtual SQL Server and the disk group need to be available on the same clustered node. If SQL Server on the Primary host is already installed, make sure you change the configuration to make it the same when you set up SQL Server on the VVR Secondary host. You should align the configuration before attempting to attach the replicated database in case of failover due to migration or disaster. The following sections give procedures on installing and configuring a new SQL Server setup using VVR replication and installing and configuring an existing SQL Server setup using VVR replication. 30 Using VERITAS Volume Replicator for Disaster Recovery of a SQL Server Database

37 Setting Up and Configuring the DR Solution for SQL Server in an MSCS Environment Installing and Configuring a New SQL Server Setup to Use VVR for Replication Refer to the following procedures for information on creating a new SQL Server setup to use for VVR replication on the Primary host. The following procedures are recommended for installing SQL Server, Volume Manager, and VERITAS Volume Replicator on the Primary host. To install the software 1. Install Volume Manager and VERITAS Volume Replicator. Refer to the Volume Manager user s guides for installation procedures. 2. Install virtual SQL Server (if your Primary host is clustered). Make sure the setup options are identical for SQL Servers on the VVR Primary and Secondary hosts. Refer to SQL Server Books Online for installation procedures. - If you are installing virtual SQL Server 7.0, this involves upgrading your existing SQL Server If you are installing virtual SQL Server 2000, you can directly install it without any pre-installation requirements. To create volumes if you have no user database set up 1. Start the VERITAS Volume Manager Console and connect to the Primary host. Use the host name/ip address of the NIC card used by VVR. Note: VVR uses the name of the connected host to create VVR objects, such as RLink. Use the virtual SQL Server name to connect to the Primary or Secondary cluster. 2. Create a Dynamic Disk Group on the Secondary host (if it is clustered) using the New Disk Group wizard. 3. Create volumes in that disk group on the Primary host using the New Volume wizard. Note: Make sure the Replicated Volumes are the same size on the Primary and Secondary hosts before setting up and configuring your disaster recovery solutions. Chapter 3, DR Solution for SQL Server with MSCS 31

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