Hardware manual

Group Administration Data recovery
13–9
• If the original volume becomes permanently unavailable, you can make the inbound replica set promotion
permanent. See Making an inbound replica set promotion permanent on
page 13-13.
Recovery volume restrictions
To temporarily fail over a volume to the secondary group, you promote the volume’s inbound replica set to a
recovery volume. Users can connect to the recovery volume and resume access the volume data.
All volume operations apply to a recovery volume, with some exceptions. Y
ou cannot change:
• Volume size
• Volume name
• Public alias
• RAID preference
• Replication partner
• Thin provisioning settings (applicable only to recovery
template volumes and
recovery thin clone volumes)
• Permission (applicable only to recovery template volumes)
In addit
ion, you cannot delete a recovery template volume if there are still recovery thi
n clone volumes, thin clone
replica sets, or permanently promoted thin clone replica sets attached to the volume.
See Chapter 9, Basic vo
lume operations for information about modifying volumes.
Replicating a recovery volume to the primary group
When the original volume on the primary group becomes available, you can replicate the recovery volume to the
primary group. This action synchronizes the data across both groups and protects the recovery volume. During the
replication, initiators can continue to access the recovery volume.
Recommendation: De
ll recommends that you replicate the recovery volume to the primary group immediately
before failing back to the primary group. This is because the volume is offline during the final
replication that is part of failing back to the primary group.
Restriction: Yo
u cannot replicate a recovery template volume.
The Replicate to Partner operation is available on
ly if the primary group and the secondary group are running PS
Series Firmware Version 4.0 or greater. If you do not meet this requirement, you must perform the steps
individually, as described in Manually performing the replicate to partner oper
ation on page 13-16.
How quickly you can replicate the recovery volume depends on the pres
ence of the failback snapshot on the
primary group. The failback snapshot establishes the failback baseline, which is the point in time at which the
volume on the primary group and the most recent complete replica on the secondary group have the same data. If
the failback snapshot exists, only the changes made to the recovery volume are replicated. If the failback snapshot
does not exist, the first replication is a complete copy of the recovery volume data.
1. Obtain the name and password for a group administrator account on the primary group.
2. Click
Volumes, expand Volumes, select the recovery volume, and then click Replicate to partner.