Hardware manual

Group Administration Data recovery
13–2
Data recovery procedures
Table 13-1 describes common data recovery procedures.
Table 13-1: Data Recovery Procedures
Goal Procedure Considerations Reference
Fail over and fail back a
volume
.
Use this method if the
volume is unavailable
due t
o a failure or
maintenance.
1. Promote the replica set to a recovery volume.
2. Demote the volume to a failback replica set.
3. Replicate the recovery volume.
4. Demote the recovery volume to a replica set.
5. Promote the failback repli
ca set to
a volume.
If the failback snapshot
is not available on the
pri
mary group, you
must replicate the full
recovery volume,
instead of just the
changes.
Failing over and
failing back a volume
on page 13-2
Make a temporary copy
of volu
me data avai
lable
on the primary group.
1. Promote the replica set to a recovery volume.
2. Perform the operation on
the
recovery
volume.
3. Demote the recovery volume to an inbound
replica set.
This method assumes
you
do n
ot want to
preserve writes made to
the recovery volume.
Making a temporary
volume available on
the secondary group
on page 13-12
Permanently switch
partner rol
es in
a volume
replication configuration.
1. Permanently promote the replica set
to a
volume.
2. Permanently demote the volume to an
inbo
und replica set.
3. Configure the volume to replicate from the
new primary group to
the new secondary
group.
If the failback snapshot
does not exi
st, the first
replication after the
role switch is a
complete copy of the
volume data.
Permanently
switching partner
roles o
n page 13-12
Permanently host the
volume
on the group that
was the secondary group.
1. If the volume is available, set the volume
of
fline.
2. Permanently promote the replica set to a
volum
e.
3. Optionally, replicate the new volume.
The first replication of
the new vo
lume
is a
complete copy of the
volume data.
Permanently
promoting a replica
set to a volume on
page 13-14
Failing over and failing back a volume
If a failure or maintenance in the primary group makes a volume unavailable, you can fail over to the secondary
group and allow users to access the volume. If the primary group becomes available, you can fail back to the
primary group.
Restriction: You canno
t replicate a recovery template volume, and you cannot demote a template volume to a
failback replica set.
1. Promote the replica set to a recovery volume (and snapshot
s) on the secondary group, and allow initiators to
connect to the volume. You can choose to keep the same iSCSI target name to facilitate iSCSI initiator access
to the recovery volume. See Promoting an inbound replica set to a recovery volume.
2. When the original volume on the primary group becomes available, synchronize the volum
e data on both
groups. Use the Replicate to Partner operation to:
• Demote the original volume to a failback replica set o
n the primary group.
• Replicate the recovery volume to the primary grou
p. If you kept the failback snapshot for the original
volume, only the changes made to the recovery volume are replicated.