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128 Configuration: Disk Groups and Virtual Disks
8
Select the relevant Physical disks in the
Unassigned physical disks
area, as
hot spares for the selected disk and click
OK
.
9
To unassign hot spares, in the
Hot Spare Coverage
window, select physical
disks in the
Hot spare physical disks
area.
10
Review the information about the hot spare coverage in the
Details
area.
11
Click
Unassign
.
A message prompts you to confirm the operation.
12
Ty p e
yes
and click
OK
.
Hot Spares and Rebuild
A valuable strategy to protect data is to assign available physical disks in the
storage array as hot spares. A hot spare adds another level of fault tolerance to
the storage array.
A hot spare is an idle, powered-on, stand-by physical disk ready for immediate
use in case of disk failure. If a hot spare is defined in an enclosure in which a
redundant virtual disk experiences a physical disk failure, a rebuild of the
degraded virtual disk is automatically initiated by the RAID controller
modules. If no hot spares are defined, the rebuild process is initiated by the
RAID controller modules when a replacement physical disk is inserted into
the storage array.
Global Hot Spares
The MD3600i Series supports global hot spares. A global hot spare can
replace a failed physical disk in any virtual disk with a redundant RAID level
as long as the capacity of the hot spare is equal to or larger than the size of the
configured capacity on the physical disk it replaces, including its metadata.
book.book Page 128 Thursday, December 9, 2010 3:20 PM