
Chapter 9: Drive Management
RAID Expansion - Mode 2 (3/3)
3
RAID 5 (4GB)
4 GB
4 GB
4 GB
RAID
Expansion
RAID 5 (8GB)
or
RAID 5 (8GB)
n
n+1
partitions
Partition
In use
Unused
After the RAID Expansion, the additional capacity
will appear as another partition. Adding the extra
capacity into the existing partition requires OS
support.
Figure 9-12: RAID Expansion Mode 2 (3/3)
IMPORTANT!
The increased capacity from either expansion type will be listed as a
new partition.
Three new drives are scanned in. To add the drives to the logical drive,
select the logical drive where they will be added, then choose the Add
Disk tab to begin the process described above. Select one or more drives
to add and click the Add Disk button. When you have selected all of the
new drives you want to add, click OK.
When you return to the partition table, you will notice that either partition
0 or the last partition will now be larger than before.
Follow the directions in the next chapter to map the new partition to a
host LUN. The new partition must be mapped to a host LUN in order for
the HBA (host-bus adapter) to see it.
9.2.5 Adding Spare Drive Assignments
You can assign spare drives to a logical drive to serve as backups for
failed drives. In the event of a drive failure, the spare drive will be
automatically configured into the array and reconstruction (or rebuilding)
will immediately commence.
Logical drives can support multiple spare drives; however, this
configuration is rarely used due to its high cost and the uncommon
occurrences of drive failures. A practical configuration calls for one spare
drive per logical drive. After rebuilding on this drive, just replace the
failed drive and then configure the replacement as the new spare drive.
Logical Drive Management 9-15
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