NETGEAR ReadyDATA 5200 Software Manual page 30

• Vertical expansion. Expand the volume by replacing all disks in the volume with
higher-capacity disks.
Expansion is immediate, independent of the amount of stored data on the volume, and does
not affect users. You cannot change the RAID level during the expansion. The only exception
is a horizontal expansion of a volume with RAID 1, which becomes RAID 10.
Horizontal Expansion
Horizontal expansion requires that you add the correct number of disks for the selected RAID
level, and that the disks are of the same physical performance level (disk type, speed, and
size). For example, you can expand an existing volume that consists of four disks in a RAID 6
set by adding four more disks.
The following table explains the minimum number of disks required to expand a volume
horizontally:
Table 4. Disks required for horizontal volume expansion
RAID Level Number of Disks Required for Expansion
RAID 0 Any.
RAID 1 Even number. RAID level automatically upgrades to RAID 10.
RAID 5 3 or a multiple of 3.
RAID 6 4 or a multiple of 4.
RAID 10 4 or more, but an even number.
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To expand an existing volume horizontally:
1. Select System > Storage.
The Storage screen displays:
ReadyDATA OS 1.2
Manage Disks and Volumes
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