Backup with the Enterprise Virtual Array VSS and VDS hardware provider
There are three replica types available when backing up using the Enterprise Virtual
Array (EVA) hardware provider:
• Standard snapshot
• Vsnap
• Snapclone
However, in the Data Protector GUI, you can select only between standard snapshot
(Snapshot (Differential)) and snapclone (Mirror/Clone (Plex)). To create vsnaps, you
must first configure hardware provider to create vsnaps.
For instant recovery, only snapclone (Mirror/Clone (Plex) replica type) is supported.
For more information, see “Snapshot replica” on page 361.
Backup with the Disk Array XP VSS and VDS hardware provider
There are two configuration modes available for the backup with the Disk Array XP
(XP) hardware provider:
• VSS compliant mode
When the XP provider is in VSS compliant mode, the source volume (P-VOL) and
its replica (S-VOL) are in simplex, unpaired state after backup. Therefore the
number of replicas (S-VOLs per P-VOL) rotated is not limited. Restore from a backup
in such a configuration is possible only by switching disks.
• Resync mode
When the XP provider is in the resync mode, the source volume (P-VOL) and its
replica (S-VOL) are in a suspended mirror relationship after backup. The maximum
number of replicas (S-VOLs per P-VOL) rotated is three, provided that the MU
range is 0-2 or 0, 1, 2. Restore from a backup in such a configuration is possible
only by re-synchronization of an S-VOL with its P-VOL.
Instant recovery
After ZDB to disk+tape or ZDB to disk, restore can be performed using instant
recovery. After ZDB to disk, instant recovery is the only possible restore method.
Backup session information is saved in the IDB, and the array-specific information
required for instant recovery is saved in the VSS database (VSSDB).
Instant recovery consists of two phases:
Zero downtime backup integration guide 337
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