Areca ARC-1213-4I Bedienungsanleitung PDF herunterladen (Seite 183)

183

APPENDIX

on the existing volume sets (residing on the newly expanded

RAID set) is redistributed evenly across all the disks. A contigu-

ous block of unused capacity is made available on the RAID set.

The unused capacity can be used to create additional volume

sets.

A disk, to be added to a RAID set, must be in normal mode (not

failed), free (not spare, in a RAID set, or passed through to

host) and must have at least the same capacity as the smallest

disk capacity already in the RAID set.

Capacity expansion is only permitted to proceed if all volumes

on the RAID set are in the normal status. During the expansion

process, the volume sets being expanded can be accessed by

the host system. In addition, the volume sets with RAID level 1,

10, 3, 5 or 6 are protected against data loss in the event of disk

failure(s). In the case of disk failure, the volume set changes

from “migrating” state to “migrating+degraded“ state. When the

expansion is completed, the volume set would then transition to

“degraded” mode. If a global hot spare is present, then it further

changes to the “rebuilding” state.

The expansion process is illustrated as following gure.

RAID controller redistributes the original volume set over the

original and newly added disks, using the same fault-tolerance

conguration. The unused capacity on the expand RAID set can

then be used to create an additional volume set, with a different

fault tolerance setting (if required by the user.)

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Areca ARC-1213-4I Bedienungsanleitung Seite 183