INTRODUCTION
17
must be completed before the volume set is ready for system
accesses.
1.3.3.2 Array Roaming
The ARC-5030/6020 store RAID configuration information on
the disk drives. The adapters therefor protect the configuration
settings in the event of controller failure. Array roaming allows
the administrators the ability to move a completele raid set to
another system without losing RAID configuration information or
data on that raid set. So, if a server fails, the raid set disk drives
can be moved to another server with an identical RAID card and
the disks can be inserted in any order.
1.3.3.3 Online Capacity Expansion
Online Capacity Expansion makes it possible to add one or
more physical drives to a volume set without interrupting
server operation, eliminating the need to backup and restore
after reconfiguration of the raid set. When disks are added to
a raid set, unused capacity is added to the end of the raid set.
Then, data on the existing volume sets (residing on the newly
expanded raid set) is redistributed evenly across all the disks.
A contiguous 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 levels 0, 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 transitions
from “migrating” state to “midegraded“ 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
Summary of Contents for ARC-5030 Series
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