P/N: 900-10004-00 REV 02 USER GUIDE, IOSAFE R4
39
►
ADDING A VOLUME
You will then be presented with the
Add Volume
tab listing the available configurable space on the
hard disks. All the disks will be selected by default. You can elect to specify a hot spare disk if you
wish. A hot spare remains in standby mode and will automatically regenerate the data from a failed
disk from the volume. A hot spare disk is only available for RAID level 1 and RAID level 5 if there
are enough disks to fulfill the required minimum plus one.
Select Hard Disks
In our example here, we’ll select the first three disks and elect not to specify any of t hem as a hot
spare.
Select RAID level
RAID level determines how the redundancy, capacity utilization, and performance is implemented
for the volume. See Appendix A, “RAID Levels Simplified”, for more information. Typically in a
three or more disk configuration, RAID level 5 is recommended.
In our example above, we selected RAID level 5 for the three selected disks.
Specify reserve space for snapshot
Next, select the amount of the volume you wish to allocate for snapshots. You can elect to specify 0
if you wish to disable snapshot capability, or you can specify a 5GB increment from 5 to 100GB.
This represents the amount of data you feel would be changing while the snapshot is active. This
typically depends on how often you schedule your snapshot (see following section on snapshot), and
the maximum amount of data (plus padding) you feel will change during that time. Make sure to