APC RAID Subsystem SCSI-SATA II - Manual (Page 74)

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unfortunate reason it might be (e.g. virus attack, data corruption, human errors
and so on). Snap UDV is allocated within the same VG in which the snapshot is
taken, we suggest to reserve 20% of VG size or more for snapshot space.
Please refer to Figure 4.4.1 for snapshot concept.
Figure 4.4.1
4.4.1 Create snapshot volume
To take a snapshot of the data, please follow the procedures.
1. Select “/ Volume config / User data volume”.
2. Choose a UDV to do snapshot by clicking the blue square button
“ ” in the “Snapshot (GB)” column, it will direct to a setup page.
The maximum snapshot space is 2TB which user can setup the space
no bigger than 2048GB.
3. Set up the size for snapshot. The size is suggested to be 20% of UDV
size at least, then click “ “. It will go back to the
UDV page and the size will show in snapshot column. It may not be the
same as the number entered because some is reserved for snapshot
internal usage. There will be 2 numbers in “Snapshot (GB)” column.
Caution
Snapshot /rollback features need 512MB RAM at least. Please
also refer to RAM certification list in Appendix A.