User manual

Tips

The size of UDV extension must be larger than original.

Caution

UDV extension cannot be executed during rebuild or migration.

4.4 Snapshot/Rollback (optional)

Snapshot function will freeze the data at the moment while taking snapshot.

When executing snapshot, it will become a new snap UDV, which can be

attached a LUN then use it as a disk. Rollback function can return the whole

data back to the time taking snapshot in order to avoid virus intrusion or files

deletion by accident. Snapshot uses the same disk space of associated VG, we

suggest to leave 20% of VG size or more for snapshot space. Please refer to

Figure 4.4.1 for snapshot concept.

Figure 4.4.1

Caution

Snapshot/rollback features need 512MB RAM or more. Please

refer to a certification list for RAM in A

endix A.

Enhance technology UltraStor RS16

- 51 -