session continues with creating a new replica and leaving the old one on the array.
Note that in this case, if there is no space on the disk array for creating a new replica,
the backup session also fails.
If you set the OB2VSS_IGNORE_BACKUP_DISK_CHANGES omnirc variable to 1,
the backup session continues by removing the old replica and creating a new one
in its place.
Microsoft Exchange Server 2007 writer concepts
This section gives details of additional features that Microsoft Exchange Server 2007
supports.
Backup
Microsoft Exchange Server 2007 offers two models of replication for data protection
that are supported by Data Protector.
• local continuous replication (LCR)
With LCR, you can create and maintain an exact copy (LCR copy) of databases
in a storage group. LCR copies are used in the event of data corruption, since
you can switch the Exchange server to use LCR copies in only a few seconds. If
an LCR copy is used for backup and is located on a different disk from the original
data, the load on a production database is minimal.
• cluster continuous replication (CCR)
CCR has the same characteristics as LCR. The only difference is that in the CCR
environment, databases and transaction logs are replicated to separate servers.
Therefore, CCR copies can be used for disaster recovery. You can perform VSS
backups on the passive Exchange Server node where the CCR copy is located
and thus reduce the load on the active node.
The replicated storage groups are represented as a new Exchange Server writer
instance, Exchange Replication Service. They are backed up in the same way as
original or production storage groups.
If using LCR or CCR with Standby Continuous Replication (SCR) configured, backups
can only be performed on the source side of the SCR. Microsoft does not support
backups on the SCR target side. For further information on SCR and supported SCR
configurations, refer to the Microsoft website.
Integrating the Data Protector ZDB integrations and Microsoft Volume Shadow Copy Service342
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