Datoptic ARC-1680 Series Instrukcja Użytkownika Pobierz pdf (Strona 168)

APPENDIX

168

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.

The SAS 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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Datoptic ARC-1680 Series Instrukcja Użytkownika Strona 168