Interoute Use Case. SQL 2016 Always On in Interoute VDC. Last updated 11 December 2017 ENGINEERED FOR THE AMBITIOUS
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1 Interoute Use Case SQL 2016 Always On in Interoute VDC Last updated 11 December 2017 ENGINEERED FOR THE AMBITIOUS
2 VERSION HISTORY Version Date Title Author 1 11 / 12 / 17 SQL 2016 Always On in Interoute VDC Gareth Davies This Interoute use case was written for a technical audience. The commentary contained is not legal advice and any organisation using this document should not rely on it as such. We may update this document as our products and services evolve. If you have any questions or comments about this document, please don't hesitate to contact our team for assistance. Visit or write to us at vdc.enquiries@interoute.com Confidentiality Statement Interoute 2017 This document contains information proprietary to and/or considered confidential by Interoute. Except as otherwise provided no part of this document may be reproduced, stored or transmitted in any form or by any means whether graphic, electronic or mechanical, including photocopying, recording, taping or storage in any information retrieval system, for any purpose, without prior written permission of Interoute. Interoute is a trading name of Interoute Communications Limited, registered in England number , registered address: Interoute, 31st Floor, 25 Canada Square, Canary Wharf, London E14 5LQ. Nothing within this document may be construed as an offer to supply goods or services except where explicitly stated. All sales are subject to contract. Interoute Communications Limited 2
3 CONTENTS VERSION HISTORY 2 1. INTRODUCTION 4 2. INTENDED AUDIENCE 4 3. PRE-REQUISITES 5 4. SOLUTION OVERVIEW UNIQUE NETWORK SUBNETS DEPLOY DIRECT CONNECT PRIVATE GROUP DEPLOY DIRECT CONNECT PRIVATE NETWORKS IN VDC ZONES WINDOWS DOMAIN AND DNS SERVICES DEPLOYMENT OF WINDOWS SQL ALWAYS ON CLUSTER NODES LICENSING CONCLUSION 11 Interoute Use Case Page 3 of 12
4 1. INTRODUCTION Read this use case to learn how you can deploy Interoute Virtual Data Centre (VDC) and Microsoft SQL Always On availability groups to create a cost effective, highly available database service. Maintaining database availability can present significant challenges and approaches to doing so often involves the use of expensive dedicated hardware which replicates the data either locally within the same DC or cross-site to a secondary DC location. These approaches commonly require expensive high bandwidth links and cross-site layer 2 stretched subnets increasing networking complexity, risk and management overhead significantly to maintain availability. With the advent of Microsoft SQL Always On availability groups it has become possible to create a highly available database service without the need for expensive shared storage either locally or cross site, removing the need for expensive storage technologies and high bandwidth network links to replicate the data. Furthermore the Always On feature allows for resilient SQL instances to be in different routable subnets from each other while supporting full failover capability, removing the need for layer 2 stretching and significantly reducing complexity, risk and management overhead. These feature introductions in SQL have become particularly relevant when deploying databases in to Cloud environments such as the Interoute Virtual Data Centre (VDC). The Interoute VDC platform provides use of the Interoute high bandwidth private MPLS backbone network between VDC locations to all customers at no additional cost. This allows end customers to build SQL Always On groups in Interoute VDC that can replicate databases either asynchronously or synchronously with no additional bandwidth or network link charges. Coupled to the above, Interoute also offers SSD storage for the same cost as magnetic spinning disk so customers have complete flexibility to choose to use either type of disk to meet their specific database needs in Interoute VDC. This document has been created to show a high level example approach to building a highly available Microsoft SQL 2016 Always On availability cluster with the database hosting nodes across two VDC zones and a file share Quorum witness in a third zone. Each Interoute VDC zone is located within a different physical DC location and as such the architecture described in this document will not only allow for migrating workloads between nodes in the cluster cross-zone to aid with patching, maintenance and upgrades. It will also protect against the failure of a hardware device within a VDC Zone or even a complete datacentre failure while maintaining the availability of the SQL database environment. 2. INTENDED AUDIENCE The intended audience is any Interoute customer who wishes to host their Microsoft SQL databases in a highly available multi-zone way in Interoute VDC. The use case document will not cover the steps for installing and configuring Windows clustering or SQL, focusing solely on the elements related to configuration of the Interoute VDC environment. Thus the document presumes experience of configuring and managing Windows operating systems, working with Microsoft Windows Server Failover Clusters (WSFC) and installing and managing SQL Server on the part of the reader. Interoute Use Case Page 4 of 12
5 3. PRE-REQUISITES To create a Microsoft SQL 2016 Always On Availability Group using the methodology suggested by this document, hosted across multiple VDC Zones, a number of pre-requisite steps are assumed: Unique network subnets for each Interoute VDC zone which will host members of the Always On availability group Deployment of a direct connect private group in Interoute VDC (Used for cross-zone routing) Deployment of direct connect private networks in each of the Interoute VDC zones which will host cluster nodes, file share witness or quorum services Pre-existing Windows Domain to host authentication services for the Always On availability group and file share or quorum witness Pre-existing DNS services to host naming for the SQL Always On availability group and clients Deployment of the Windows servers which will host both SQL services and file share witness or Quorum services to the cluster Licensing for SQL server 2016, either Standard or Enterprise depending on the specific customer requirements It should be noted that in SQL 2016 Standard, Basic Always On availability groups are now supported, but importantly this comes with some key limitations such as it only being possible to replicate a single database and for no read access on secondary DB replicas. For this reason the larger majority of customers will likely deploy the Enterprise version of SQL so they are not limited in this way. For a fuller outline of the limitations, please read the below article: Licensing for the SQL environment remains the responsibility of the customer, however, Interoute can sell licenses under our Microsoft SPLA agreement. Please contact us at vdc.enquiries@interoute.com for further information. Further pre-requisites for the implementation of this solution are outside the scope of this document. There is a great deal of further information on deploying SQL Always On availability groups which can be found in the Microsoft online documentation, Technet and Forums. 4. SOLUTION OVERVIEW To make use of the low latency capabilities of the Interoute Backbone MPLS network this solution suggests the implementation of the SQL Always On availability group in to the VDC zones in London and Paris with the cluster file share quorum witness hosted in the VDC zone in Amsterdam. The three Selected VDC zones maintain an average RTT latency of 9ms or lower when measured over a 2 week period, which is ideal for hosting highly available applications such as SQL Always On. This simple approach allows all the benefits of SQL Always On availability groups to be realised by making use of the low latency and high bandwidth availability provided by the Interoute backbone MPLS network to replicate the databases and provide failover in the event of a hosting node failure or the even more unlikely event of a complete datacentre failure in one of the VDC zones Interoute Use Case Page 5 of 12
6 Diagram 1 Solution Overview VDC London SQL FileShare Witness VDC Paris FS VDC Zone Amsterdam Private Direct Connect Group IIS IIS App Front End Server 1 App Front End Server 2 db Always On Availability Group Node 1 Always On Availability Group Listener db Always On Availability Group Node 2 VDC - London VDC - Paris Interoute Use Case Page 6 of 12
7 Diagram 1 above shows some IIS front end web/ application servers as an example of the usage of the DB services provided by the SQL Always On availability group. In the proposed example the primary DB replica would be hosted on the SQL node in London and the secondary replica would be hosted on the SQL node in Paris. Both front end app servers would connect to the Primary replica of the DB hosted in London during normal day-to-day operations. Then during a planned maintenance window the SQL Node in Paris would be promoted to the primary replica and failover would occur automatically to this node by use of the multi-subnet feature of the Always On availability group listener. extra network charges to end customers. Implementation of a Direct Connect Group can be done from your VDC My Services account portal using the steps identified below: Login to the My Services portal and select Direct connect groups from the panel in the top left, once the networks appear select Direct connect groups from the Select view pulldown menu as pictured below: In the event of an unplanned failure, the result would be the same as above, with the exception that failover would be automated by the cluster on detection that the node hosting the primary replica had failed. 4.1 UNIQUE NETWORK SUBNETS The suggested solution requires the implementation of three unique layer 3 routable subnets in to VDC which do not overlap with any other subnets routable anywhere else on your wider network. Interoute VDC provides customers with complete flexibility to choose the network subnets they wish to use when implementing the networking in to VDC. For this use case, the below network subnets have been chosen to use as examples: Select the + Add Direct Connect Group button from the top right of the portal as pictured below: You will be presented with an entry window, asking you to name the Direct Connect Group, enter the name you require as pictured below: London: /24, Gateway: Paris: /24, Gateway: Amsterdam: /24, Gateway: DEPLOY DIRECT CONNECT PRIVATE GROUP The VDC Direct Connect Private Group allows Direct Connect networks in different VDC zones to route traffic between zones automatically using the Interoute MPLS fibre backbone network with no Click OK to complete and the Direct connect Group will be created using the name entered in the box. Interoute Use Case Page 7 of 12
8 4.3 DEPLOY DIRECT CONNECT PRIVATE NETWORKS IN VDC ZONES Direct Connect Private networks are VDC zone specific and allow you to create a unique subnet in the VDC zone you wish to host virtual servers. To make them routable between other zones, all direct connect private networks must be made a member of the same Direct Connect Group during provisioning. Direct Connect Private networks can be provisioned and made a member of a Direct Connect group by performing the following steps in the VDC myservice interface: Login to the My Services portal and select Networks from the panel in the top left, ensure Networks is selected in the Select view pulldown menu as pictured below: The above diagram has been filled out as if the network for London was to be created and added to the Default Direct Connect group, the process is the same for creation of each of the Direct Connect Private network just with a different VDC zone and CIDR address entered. Importantly it should be noted that the creation of Direct Connect Groups and Networks can take up to 24 hours to complete since they rely on the replication of routes across the Interoute fibre MPLS backbone network to communicate. Please see below some help in understanding what each setting means: Identifier = Friendly name network will be showed as in VDC interface Network Type = Direct Connect, Private/Public or Local (Select Direct Connect Private for our use case) Gateway Services = Internet egress gateway if required Zone = Which VDC zone to deploy the network in to Select the + Add Network button from the top right of the portal as pictured below: CIDR = Subnet address in CIDR format for example /24 DCG Name = The Direct Connect Group you would like to place the network in to Gateway = The gateway address you would like to add to the network (Generally.1 or.254 but you can choose any) 4.4 WINDOWS DOMAIN AND DNS SERVICES You will be presented with the Add Network box in the below example picture: The deployment of a Windows domain and DNS services is outside the scope of this document and it is presumed that when deploying the SQL Always Interoute Use Case Page 8 of 12
9 On cluster you will already have these basic network services in place prior to proceeding. 4.5 DEPLOYMENT OF WINDOWS SQL ALWAYS ON CLUSTER NODES Deployment of Windows servers in to the VDC networks once created is a simple process which can be seen in the below steps that have been configured as if deploying the first SQL node for our use case in to the London VDC zone during the below steps. Login to the My Services portal and select Virtual Machines from the panel on the left, select +Add Virtual Machines from the top right as pictured below: On the Compute offering page select how much CPU and memory you would like to configure the server with, in this case the server has been configured with 4 CPU and 16GB of memory as pictured below: This will open the add virtual machines wizard as pictured below, on the setup page select the Zone you wish to deploy your virtual machine in to and click next as pictured: On the Affinity page select to add the SQL node to an affinity group if required, this however isn t necessary so can be skipped by clicking next which will move to the network page. On the network page, select the network to deploy the server in to and if wished enter the IP address of the new server by clicking the settings icon and entering it in the bow as pictured below: On the select a template page Click the OS type on the left and select an OS revision and template on the right, in this case we have chosen Windows server 2012 R2, ensure to tick the box to agree to the licensing terms as pictured below: Interoute Use Case Page 9 of 12
10 Lastly, on the Review page of the wizard as pictured below, enter an optional friendly name to view in the VDC interface for the server, select your keyboard language and review all other settings to confirm they are correct, once completed, click next and the server will be automatically deployed: Once here select the + Add Volume button from the top right as pictured below: This will open the add volume wizard which can be seen pictured below: The server will now appear in the VDC interface under Virtual Machines and will shortly be available to login to and use. The process is identical for all 3 nodes to be deployed, just with a different zone, network and IP config. Once the server is deployed you can add extra disk volumes to be used by SQL to the server using the My Services interface by using the below steps. Select storage from the left panel and ensure the select view dropdown box has volumes selected as pictured below: Enter an easily identifiable name to ensure you know what server the disk will be used by, which VDC zone to place it in, what type of disk to use and the size of the volume to be created. In the above example, SSD disk has been selected, however, you may wish to assess requirements carefully. SSD is best at handling random I/O (Usually generated by databases) and spinning disk is best at handling sequential I/O (Usually generated by database logging) both types can be added and logs and databases split at the filesystem Interoute Use Case Page 10 of 12
11 level to create the best overall performance for your SQL server. Click OK to launch the creation of the volume, Once the Volume has been created you can select the volume name in the storage panel and select the attach volume button as highlighted in the picture below: Customers must be aware however that licensing of their application environments within VDC is their responsibility, including Microsoft SQL. It is possible for customers to buy Microsoft SQL licensing through Interoute s SPLA licensing program, however, this type of license cannot be deployed automatically through the My Services interface but instead be purchased by contacting Interoute. Please contact us at vdc.enquiries@interoute.com for further information. 5. CONCLUSION The Microsoft SQL Always on solution is perfectly placed to provide high availability for database services across two as per our use case, or more locations. This will open the attach volume wizard as pictured below: Select the server you wish to attach the volume to from the dropdown list, and click OK to attach it. This completes the process for creating nodes for hosting SQL Always On availability groups in VDC. After all the above steps have been completed, you can then proceed to install SQL on your nodes and create a Microsoft Windows failover cluster that crosses your installed nodes in VDC. 4.6 LICENSING The license for the operating system is sold to customers automatically under Interoute s Microsoft SPLA agreement when the server is deployed in to the VDC environment. When combined with the features of VDC it becomes a very powerful and cost effective way to implement high availability stretching across not only datacentre locations but even countries. The Interoute Fibre MPLS backbone network, which is offered to customers for free when combined with VDC IAAS services, allows SQL Always on to perform at its best when separated beyond normal metro distances while still maintaining the lowest cost approach to high or even synchronous database availability with no extra bandwidth, disk I/O or egress traffic costs to consider. Therefore offering customers fully predictable pricing. This approach removes the need to purchase expensive storage technologies to provide synchronous data availability and moves the responsibility for this up to the application layer, allowing customers to take a true cloud approach to their SQL deployments without being as concerned with the underlying infrastructure. A further benefit to all of the above is the capability to deploy servers within each VDC zone using your choice of SSD and spinning disk allowing the flexibility to achieve maximum performance for your specific SQL database workloads. Interoute Use Case Page 11 of 12
12 15 DATA CENTRES 17 VIRTUAL DATA CENTRES 33 COLOCATION CENTRES 70,000 ROUTE KILOMETRES OF FIBRE NETWORK About Interoute Interoute Communications Limited is the owner/operator of one of Europe s largest cloud services platforms, which encompasses over 70,000 route kilometre of fibre, 15 data centres, 17 virtual data centres and 33 colocation centres, with connections to 206 additional third-party data centres across Europe. Its full service Unified ICT platform serves international enterprises, as well as every major European telecommunications incumbent and the major operators of North America, East and South Asia, governments and universities. These organisations find Interoute the ideal partner for Computing, Connectivity and Communications and developing new services. Interoute s Unified ICT strategy has proved attractive to enterprises looking for a scalable, secure and unconstrained platform on which they can build their voice, video, computing and data services, as well as service providers in need of high capacity international data transit and infrastructure. With established operations throughout mainland Europe, North America and Dubai, Interoute also owns and operates dense city networks throughout Europe s major business centres. For more information visit Interoute Use Case Page 12 of 12
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