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80.5 GB and the replacement drive can be 80.3, since all are rounded down to
80 GB. This permits the smaller drive to be used.
Without Capacity Coercion, the controller will not permit the use of a replacement
physical drive that is slightly smaller than the remaining working drive(s).
Initialization
Initialization is done to logical drives after they are created from a disk array.
Initialization sets all data bits in the logical drive to zero. The action is useful
because there may be residual data on the logical drives left behind from earlier
configurations. For this reason, Initialization is recommended for all new logical
drives. See ―Initializing a Logical Drive‖ on page 166 (ASUS Storage
Management) or page 240 (CLU).
Hot Spare Drive(s)
A hot spare is a disk drive that is connected to the disk array system but is not
assigned as a member of the disk array. In the event of the failure of a drive
within a functioning fault tolerant disk array, the hot spare is activated as a
member of the disk array to replace a drive that has failed.
ASUS Storage will replace a failing disk drive in a disk array with an unassigned
drive, if one is available. The unassigned drive is not part of any disk array. Such
a drive is called a hot spare drive. There are two types:
•
Global – An unassigned disk drive available to any disk array on the ASUS
Storage.
•
Dedicated – An unassigned disk drive that can only be used by a specified
disk array.
The hot spare policy function lets you choose whether a disk array will access
any unassigned disk drive or a designated drive in the event of disk drive failure.
See ―Managing Spare Drives‖ on page 171 (ASUS Storage Management) or
page 236 (CLU) for information on how to make this setting.
The spare drive effectively takes the place of the failed drive and the RAID
system immediately begins to rebuild data onto the drive. When the rebuild is
complete, the disk array is returned to fault tolerant status.
When you initialize a logical drive, all the data on the logical drive
will be lost. Backup any important data before you initialize a
logical drive.
Chapter 9: Technology Background
Caution
340
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