StorCase Technology CSI-to-SCSI Single & Dual RAID - Manual (Page 54)

Dual RAID Module User's Guide - Rev. A03 StorCase Technology, Inc.
Configuration 41
Expanding Array Capacity (OCE)
Online Capacity Expansion (OCE) allows the user to expand the arrays without having to stop
I/O activity. Only one array can be expanded at a time, and the expansion of the array must
be completed before expanding another array.
NOTES: Expanding an array does not change the size of the host operating system
partitions that reside on the array (the controller only works at the block
level, not at the file system level of the operating system). To use the new
space, a new partition must be created (using the newly added space)
or a third-party application (specific to the operating system) must be used
to change the partition size.
The OCE function may take an hour or more to complete, depending on the
array type, array size, drive speed, and other processes running the
controller.
Once an OCE has started, it cannot be aborted!
The number of drives that can be added to an array depends upon the RAID level.
Table 5: OCE Drive Additions by RAID Level
RAID Level # of Drives that can be Added
IFS_55FC
RAID 0
RAID 1
RAID 3, 4, or 5
RAID 10
Volume Set
1-4
Does not support OCE
Does not support OCE
2 or 4
1-4
RAID 50 3-5
To expand multiple-partition arrays, free space is added at the end of the array (refer to section
"Understanding Partitions" for further information).