Promise Technology Network Device EX8654 - Manual (Page 254)

SuperTrak EX Series User Manual
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Revertible
– A revertible spare drive will return to spare status when the
failed drive is replace with a new drive. See “Transition” on page 249.
Whenever possible, having a hot spare drive in your RAID system is good
protection against physical drive failure.
Partition and Format the Logical Drive
Like any other type of fixed disk media in your system, a RAID logical drive must
also be partitioned and formatted before use. Use the same method of
partitioning and formatting on an logical drive as you would any other fixed disk.
See “Appendix A: Partition and Format” on page 281.
RAID Level Migration
To migrate a disk array is to do one or both:
•
Change its RAID level
• Increase the number of physical drives (sometimes called expansion)
On SuperTrak, RAID level migration is performed on the disk array but it applies
to the logical drives. Migration takes place on an existing Functional disk array
without disturbing the existing data. While the disk array is migrating, you can
access the data as before. When migration is complete, your disk array will have
a different RAID level and/or a larger capacity.
In most cases, you must add one or more physical drives during the migration
process. You can never reduce the number of physical drives.
The tables below shows the migration options for a source logical drive according
to its RAID level. The available target RAID levels are shown with their
requirements.
You must use WebPAM PRO to migrate a disk array. See “Migrating a Disk
Array” on page 161.