User manual

iSCSI GbE to SAS/SATA II RAID Subsystem
User Manual
103
6.4.1 Create Snapshot Volume
To take a snapshot of the data, please follow the procedures.
1. Select “/ Volume configuration / Virtual disk”.
2. Check the gray button next to the VD number; click “Set snapshot space”.
3. Set up the size for snapshot. The minimum size is suggested to be 20% of VD
size, then click “OK“. It will go back to the VD page and the size will show in
snapshot column. It may not be the same as the number entered because
some size is reserved for snapshot internal usage. There will be 2 numbers in
“Snapshot (MB)” column. These numbers are “Used snapshot space” and
“Total snapshot space”.
4. There are two methods to take snapshot. In “/ Volume configuration /
Virtual disk”, move the mouse pointer to the gray button next to the VD
number; click “Take snapshot”. Or in “/ Volume configuration /
Snapshot”, click “Take snapshot”.
5. Enter a snapshot name, then click “OK”. A snapshot VD is created.
6. Select “/ Volume configuration / Snapshot” to display all snapshot VDs
related to the VD
7. Check gray button next to the Snapshot VD number; click “Export”. Enter a
capacity for snapshot VD. If size is zero, the exported snapshot VD will be
read only. Otherwise, the exported snapshot VD can be read / written, and the
size will be the maximum capacity to read/write.
8. Attach a LUN for snapshot VD. Please refer to the previous chapter for
attaching a LUN.
9. Done. It can be used as a disk.
This is the snapshot list of “VD-01”. There are two snapshots. Snapshot VD “SnapVD-
01” is exposed as read-only, “SnapVD-02” is exposed as read-write.