Adaptec 5325301656 - Snap Server 14000 NAS, Руководство администратора

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RAIDs
44 Snap Server Administrator Guide
Local and Global Hot Spares
A hot spare is a disk drive that can automatically replace a damaged drive in a
RAID 1, 5, 6, or 10. Designating a disk drive as a hot spare helps ensure that data is
available at all times. If one disk drive in a RAID fails or is not operating properly,
the RAID automatically uses the hot spare to rebuild itself without administrator
intervention. Snap Servers offer two kinds of hot spares: local and global.
Automatic Incorporation of Hot-Swapped Drives
If a RAID (except RAID 0) is running in degraded mode and a raw drive, a non-
GuardianOS drive, or an unassigned GuardianOS-partitioned drive is “hot-
inserted” into a Snap Server, it can be automatically assigned as a local spare and
used to rebuild the degraded RAID. If there are no degraded RAIDs, a hot-inserted
non-GuardianOS or unassigned drive will be automatically configured as a global
hot spare. To enable the automatic incorporation of an unassigned drive, go to the
Storage > RAID Sets screen and click the
RAID Settings
button.
Item Description
Definitions Local (hot) spare — A local (or dedicated) hot spare is associated
with and is available only to a single RAID. Administrators typically
create a local hot spare for RAIDs containing mission-critical data that
must always be available.
Global (hot) spare — A hot spare that may be used for any RAID 1, 5,
6, or 10 in the system (assuming sufficient capacity) as necessary.
Identifying Hot spares are identified on the Storage > Disks/Units screen using
the following icons:
Each icon will be associated with a disk in the RAID, identifying that
disk as either a local hot spare or a global hot spare.
Interaction When a drive in a RAID fails, the system looks for a hot spare in the
following order:
1
If a local hot spare dedicated to the RAID exists, use the local hot
spare.
2
If no local hot spare is available, and there is a single hot spare of
sufficient capacity, use the global hot spare.
3
If no local hot spare is available, and two global hot spares of
different capacity are available, use the smaller hot spare with
sufficient capacity.