Adding A Volume - Infrant Technologies Readynas User Manual

► A D D I N G A V O L U M E
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
is enough disks to fulfill the required minimum plus one.
S e l e c t H a r d D i s k s
In our example here, we'll select the first three disks and elect not to specify any of them as a hot
spare.
S e l e c t R A I D l e v e l
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.
S p e c i f y r e s e r v e s p a c e f o r s n a p s h o t
Next, select the percentage 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 percentage in 5% increment
from 5 to 50%.
The percentage 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 previous section on
snapshot), and the maximum amount of data (plus padding) you feel will change during that time.
Make sure to allocate enough space for worse case as the snapshot becomes unusable when its
reserved space runs out.
In our example above, we selected 10% of the volume to be reserved for snapshots.
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