Backup and Restore SOP FOR CONGO CLUSTER

Transcription

1 Backup and Restore SOP FOR CONGO CLUSTER IT Department, Congo Cluster Version 1.0 January 2008

2 1. Contents 1. CONTENTS INTRODUCTION TO BACKUPS Objectives Scope of the document Roles Version control GUIDELINES Backup type Media rotation scheme Backup automation and time Tape labeling Tape storage Back-up and restore Software PROCEDURES WITHIN DRC CLUSTER Backup type Tape labeling Media rotation scheme Backup timing Tape storage Restoration and testing... 6

3 2. Introduction to Backups Back-up is making a copy of files from a hard disk to Network Attached Storage (NAS), Storage Area Network (SAN) and/or tape for the purpose of retrieval in case the original is erased, copied over, damaged, or destroyed. In the event of a problem, the files can be restored from NAS, SAN or the tape back onto the hard disk. The backup procedure is the company IT life insurance. It is vital for a company to have a very strong and safe backup procedure in place Objectives The objective of this document is to provide guideline to the IT team for systematic and regular backups of servers and shows how to perform backup and restore operations Scope of the document This document covers operations and procedures to be followed for backups of servers located at Maersk Congo offices in compliancy with global policy for APM-Maersk offices Roles The primary responsibility for taking backup of data on servers rests with the system administrator. The responsibility of taking backup of data on desktops solely rests with the users. The users should backup critical data onto the file server in their home/personal directory. Moreover it is highly recommended to save all critical business data in the server (using network drive) Version control Version Date Author Approver Reason 1.0 November 2007 Blaise N. LEMBASI John MIETES First version 1.1 January 2008 Blaise N. LEMBASI John MIETES Revision 3. Guidelines Backup type There are three back-up levels that are used with various media rotation schemes: full back-up and two types of partial back-up called incremental and differential. Full Level A full back-up usually includes the entire system and all its files. Weekly, monthly and quarterly back-ups constitute a full back-up. The first weekly back-up should be a full back-up, usually made on Friday or over the weekend, in which all desired files are copied. Subsequent Monday through-thursday back-ups, until

4 the next full back-up, can be either incremental or differential to save time and back-up media space. Incremental Level With incremental back-up, only the files that have changed since the last full or incremental back-up are backed up. Subsequent incremental back-ups only back up those files that have changed since the previous incremental back-up. On average, incremental back-ups take less time because there are fewer files backed up. However, it takes longer to restore data since data from the last full back-up, plus data from all the incremental back-ups, must be restored. Differential Level With differential back-up, every file that has changed since the last full back-up is backed up each time. It is faster to restore a differential back-up. All you need is the last full and last differential back-up. Differential back-up is gaining in popularity because it traps files at points in time, for example, prior to virus corruption Media rotation scheme One of the preferred media rotation model is GFS. In GFS, Son" is the incremental or differential daily back-up, "Father" is the full weekly back-up, and "Grandfather" is the monthly full back-up. A total of 12 media sets are required for this basic rotation scheme (four daily, Monday Thursday; five weekly, Friday week 1-5; and three monthly, month 1-3). The media is reused on the day, week or month matching its label Backup automation and time The daily backups must be automated. Typically the backup job is scheduled to run after working hours (during the night). In the event that a backup fails a manual backup will be performed immediately Tape labeling The 12 tapes are grouped in set of tapes. They are marked in the following way: Set 1 4 tapes for daily backup: Monday - Tuesday - Wednesday Thursday Set 2 5 tapes for weekly backup: Week1 Week2 Week3 Week4 Week5 Set 3 3 tapes for weekly backup: Month1 Month2 Month Tape storage All tapes containing full backup will be stored off-site. This means that every Monday evening, we will give to the responsible of the storage the tape containing the full back-up (weekly or monthly back-ups) for storage. Every Friday morning, we will retrieve the tape that will be used for the full backup Back-up and restore Software Following software are used to take backup of Exchange and File servers:

5 VERITAS: Storage Management SAN, NAS and TAPE, Backup and Recovery, NetBackup Storage Migrator for Windows 2000 (and Exchange 2000) CAI: ARCserveIT TAPE Dell using EMC Replication Manager software HP using Power Pack software suites IBM using NSI software Double-Take If for any reason, we cannot perform back-up using the above mentioned software, we will use Microsoft NTBackup. In normal case, NT Backup is not recommended because of its limitation (it excludes all files in use, does not allow a cold restore for an exchange ). Restoration and Testing Tests of the integrity of tapes and the restoring feature of the software will be performed at regular intervals. One tape will be selected from Monthly/Weekly tapes and tested. Testing will be logged in an IT Operation Log Book. 4. Procedures within DRC cluster Backup type In DRC the backup type is: - Differential back-up for daily backup and - Full for weekly, monthly and quarterly backup Tape labeling All backup tapes will be labeled for identification purposes, as follow: Scope: the type of backup, full, incremental or differential backup Date of first use: the date the tape is used for the first time. Period: the day of the week or the week number of the year or the month of the year Serial Number: Significant when more than one tape is required for one backup session. Server name: the name of the server (for instance: SCRBAPPCDJLX001) Rotation period: the rotation or retention period Example Daily backup tapes labels Scope : FULL Date of first use : 11 Feb 2008 Period : MON Rotation : One Week Server Name : SCRBAPPCDJLX001 Serial No : 1/1

6 Restoration test date : - Weekly backup tapes labels Scope : FULL Date of first use : 15 Feb 2008 Period : WEEK -01 Rotation : 4 weeks Server Name : SCRBAPPCDJLX001 Serial No : 1/1 Restoration test date : - Monthly backup tapes labels Scope : FULL Date of first use : 8 Feb 2008 Month : JAN-06 Rotation : one Semester Server Name : SCRAPPCDJLX001 Serial No : 1/1 Restoration test date : Media rotation scheme The chosen model for DRC Cluster is the Grandfather-Father-Son (GFS) Backup timing The daily backups are automated. Typically the backup job is scheduled to run at 20:00 during the night. Every morning the IT assistant will check that the backup was successful. In the event that a backup fails a manual backup will be performed immediately Tape storage The weekly, monthly and quarterly backup tapes will be stored off site. For Kinshasa tapes will be stored in a safe at Country Top residence and for Matadi at Branch Manager Residence. Every Monday, the IT assistant will give the backup tape for storage to the manager (country top or branch manager) and he will receive a weekly, monthly or quarterly tape from same Restoration and testing Tests of the integrity of tapes and the restoring feature of the software will be performed on first Saturday of each month. One tape will be selected from Monthly/Weekly/quarterly tapes and tested. Testing will be logged in an IT Operation Log Book.