- 54 -
(Figure 4.4.2.1: It will take snapshots every hour, and keep the last 8 snapshot copies.)
4.4.3 Rollback
The data in snapshot UDV can rollback to original UDV. Please follow the
procedures.
1. Select
“/ Volume config / User data volume”
.
2. Take one or more snapshots. Please refer to section 4.4.1 for more
detail.
3. Click
“
” in
“Snapshot (MB)”
column to rollback the data, which is at
the time of taking snapshot.
Rollback function has some constraints as described in the following:
1. Minimum RAM size of enabling rollback function is
512MB
.
2. When executing rollback, the original UDV cannot be accessed for a
while. At this time, transfer connections from original UDV to snap UDV,
and then start rollback.
3. During rollback data from snap UDV to original UDV, the original UDV
can be accessed and the data in it shown just like finished rollback. At
the same time, the other related snap UDV(s) will not be accessed.
4. After rollback process finished, the other related snap UDV(s) will be
deleted, and snapshot space will be set to
0
.
4.5 Disk
roaming
Physical disks can be re-sequenced in the same system or move whole physical
disks from system-1 to system-2. This is called disk roaming. Disk roaming has
some constraints as described in the following:
Tips
Daily snapshot will be taken at every 00:00. Weekly snapshot
will be taken on every Monday 00:00.
Caution
Before executing rollback, it is better to dismount file system for
flushing data from cache to disks in OS.
