Instant Recovery for HP StorageWorks Enterprise Virtual Array in CA+BC Configurations

ZDB Zero downtime backup.
Overview
With instant recovery, lost or corrupted data (or rather, the whole volumes containing it) is replaced
with known good data. This good data resides on whole storage volumes, or vDisks, that had
previously been created as a BC during a zero downtime backup. These replicated target volumes
are used for restoration internally within the array involving no other backup medium or device.
The general SMISA IR flow is as follows:
1) The application system is prepared for restore by dismounting filesystems and taking volume
groups offline.
2) Source volumes are masked or unpresented from the application system.
3) The identities of each matched pair of source and target storage volumes are exchanged.
This involves the WWN, the name, and the comments of each volume.
4) The exchanged storage volume is unmasked or presented to the application system.
5) Volume groups are put online and filesystems are remounted.
Each source storage volume that is backed up using ZDB has a matching target replica volume. Note
that to enable IR, each pair of matched replica and source storage volumes must reside on the same
disk array. This is required for a valid exchange of identities, stated in the general IR flow.
However, when a source volume is attached to a DR group and thus participates in remote
replication, the EVA does not allow the WWN of that vDisk to be modified. Therefore, to prepare
your environment for instant recovery and successfully recover your data, you need to carry out the
following steps:
1) Prepare the storage volumes and the storage environment for IR following manual
procedures.
2) Perform IR with these volumes using SMISA.
3) Return the storage volumes and storage environment to the state it was before IR (optional).
The rest of this document outlines different CA+BC configurations and the manual steps to be followed
to successfully perform instant recovery.
Supported Instant Recovery Configurations
The manual steps needed to prepare the environment for IR and bring it back after IR differs based on
the current configuration of CA+BC or DR group connections.
Setup identification is based on the following environment information:
• Current site for the source side of any DR groups that include the source storage volumes
• Whether the BC or target storage volumes are on the same array (local) as the source storage
volumes, or on the remote side of the DR group (remote)
From this information, there are two possible configurations:
• Configuration I - Business Copy is on the local side of the CA link
• Configuration II - Business Copy is on the remote side of the CA link