NETGEAR ReadyNAS Pro Business Edition User Manual
Page 38
ReadyNAS Pro Business Edition User Guide
2-16
Setting Up and Managing Your ReadyNAS Pro
v1.3, November 2008
Adding a Volume
After deleting the volume, Add Volume tab displays listing the available configurable space on the
hard disks. All the disks are selected by default. You can elect to specify a hot spare disk if you
wish. A hot spare remains in standby mode and automatically regenerates the data from a failed
disk from the volume. A hot spare disk is available for RAID level 1 and RAID level 5 only if
there are enough disks to fulfill the required minimum plus one.
.
To add a volume:
1. Select the hard disks. In this example, we select the first three disks and elect not to specify
any of them as a hot spare.
2. Select the RAID level. RAID level determines how the redundancy, capacity utilization, and
performance are implemented for the volume. Typically in a configuration of three or more
disks, RAID level 5 is recommended.
In our example, we selected RAID level 5 for the three selected disks.
3. Specify the reserve space for a snapshot. Next, select the percentage of the volume you wish to
allocate for snapshots. You can specify 0 if you wish to disable snapshot capability, or you can
specify a percentage in 5 percent increments from 5 to 50 percent.
The percentage represents the amount of data you think changes while the snapshot is active.
This typically depends on how often you schedule your snapshot to occur (see
page 4-8), and the maximum amount of data (plus padding) you think changes during that
time. Make sure to allocate enough space for a worst case as the snapshot becomes unusable
when its reserved space runs out.
Figure 2-19