Asus DS300f, User Manual

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Chapter 9: Technology Background
ASUS Storage includes a function that enables you to return a hot spare drive
from a disk array back to spare status. When you create the hot spare drive,
check the Revertible box to enable this feature
. See ―Transition‖ on page 352.
See also ―Critical & Offline Disk Arrays‖ on page 384.
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.
Depending on the operating system you use, there may or may not be various
capacity limitations applicable for the different types of partitions.
RAID Level Migration
To migrate a disk array is to do one or both:
•
Change its RAID level
•
Increase the number of disk drives (sometimes called Expansion)
On ASUS Storage, 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 show the migration options for a source logical drive according
to its RAID level. The available target RAID levels are shown with their
requirements.
See ―Migrating a Disk Array‖ on page 158 or page 232.