E n h a n c e |
T e c h n o l o g y , I n c .
EnhanceRAID R4 User Manual
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Figure 5.6.3
(Figure 5.6.3: A 4-Way RAID 1 array migrates to RAID 3 array, completion is 9%.)
5.7 Snapshot
Snapshot function allows the user to take an image of the selected UDV at a
specific point in time. The snapshot is a mirror image of the UDV with the same
data. This feature allows consistent backup of data in minutes, not hours, without
system downtime. And since snapshot is done on the controller level, no special
software is necessary to do snapshots.
The Snapshot on the Box not only ensures consistent data backup, but also
availability. A snapshot can be brought online without lengthy database rebuilds.
In the event of data corruption, a last known good snapshot in time can be used
to recover a system in minutes, and not hours or days as in traditional backup
solutions.
The Snapshot image will automatically become new UDV, you can attach a LUN
to this UDV and access it on the host server. Snapshot uses the same disk
space of the associated VG. It is recommended to leave at least 20% of VG size
for snapshot space. The disk space allocated to snapshot can be customized for
each UDV by clicking the
button in the Snapshot Column of User Data
Volume info page.
To take a snapshot of the data, please follow the instructions below.
1. Enter
Volume config
.
2. Enter
User data volume
.
3. Setup the Snapshot disk space allocation for the UDV by clicking
in the Snapshot column. The size recommended for the snapshot
allocation is 20% of the free space. Click
.
4. The UDV page will now reflect the space allocation for snapshot. There
are 2 numbers in Snapshot column. These numbers represent
Free
snapshot space / Total snapshot space
.
EnhanceRAID R4 User Manual
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