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Tungsten Clustering

Restoring from Another Replica

If a restore is being performed as part of the recovery procedure, consider using the tprovision tool. This will work for restoring from the Primary or a Replica and is faster if you do not already have a backup ready to be restored.

For more information, see "Recover a failed Replica"

Data can be restored to a Replica by performing a backup on a different Replica, transferring the backup information to the Replica you want to restore, and then running restore process.

For example, to restore the host3 from a backup performed on host2:

  1. Run the backup operation on host2 :

    [LOGICAL:EXPERT] /alpha > datasource host2 backup
    Using the 'xtrabackup' backup agent.
    Replicator 'host2' starting backup
    Backup of dataSource 'host2' succeeded; uri=storage://file-system/store-0000000006.properties

  2. Copy the backup information from host2 to host3. See "Copying Backup Files" for more information on copying backup information between hosts. If you are using xtrabackup there will be additional files needed before the next step. The example below uses scp to copy a mysqldump backup:

    shell> cd /opt/continuent/backups
    shell> scp store-[0]*6[.-]* host3:$PWD/
    store-0000000006-mysqldump-812096863445699665.sql                      100%  234MB  18.0MB/s   00:13
    store-0000000006.properties                                            100%  314     0.3KB/s   00:00

    If you are using xtrabackup:

    shell> cd /opt/continuent/backups/xtrabackup
    shell> rsync -aze ssh full_xtrabackup_2014-08-16_15-44_86 host3:$PWD/

  3. Shun the datasource to be restored, and put the replicator service offline using cctrl :

    [LOGICAL] /alpha > datasource host2 shun
    [LOGICAL] /alpha > replicator host2 offline

  4. Restore the backup using cctrl :

    [LOGICAL] /alpha > datasource host2 restore

    Once the restore operation has completed, the datasource will be placed into the online state.

    Note

    Check the ownership of files if you have trouble transferring files or restoring the backup. They should be owned by the Tungsten system user to ensure proper operation.