Asus PCI-DA2200 - Manual (Page 290)

ASUS GUI RAID Manager: Array Management
4.16 Dynamic Logical Drive Expansion 4-39
Mode 2 Expansion, on the other hand, requires the same
number of higher-capacity SCSI hard disk drives for a
given logical drive.
The figure above illustrates expansion of the same 4-
Gigabyte RAID 5 logical drive using Mode 2 Expansion.
Drives are copied and replaced, one by one, onto three
higher-capacity drives.
RAID Expansion - Mode 2
(1/3)
2 GB
RAID 5 (4GB)
2 GB 2 GB
The original logical drive
1
4 GB
Copy and Replace
one of the member drives
New
Drive
2 GB
RAID 5 (4GB)
2 GB 2 GB
In use
Unused
Copy and Replace each of the member drives. Even
if one member drives fails during the Copy and
Replace, the logical drive will still be available for
access.