Meridian Data manual Critical & Offline Disk Arrays, 130, Transition Events, Watermark Events

Reported Event	Corrective Action
Transition
Transition is started	Result of settings or user action. Normal.
Transition is completed	Normal.
Transition is paused	Transition paused because of user intervention,
	schedule or a higher priority background activity.
Transition is resumed	Transition has resumed again after a pause.
Transition is stopped	Transition stopped because of user intervention or
	the logical drive was deleted.
Transition was switched	Transition changed to rebuild because the logical
to rebuild	drive went critical.
	(Transition Events)

Reported Event

Corrective Action

Watermark

Migration has	Watermarks are progress markers left as the result
detected/cleared stale NV	of interrupted RAID migrations. If the watermark was
Watermark	cleared, migration should finish.
Array was incomplete due	RAID migration was interrupted by a shutdown. If
to missing NV Watermark	array is online, try migration again. If array is offline,
	delete and recreate array.

(Watermark Events)

Critical & Offline Disk Arrays

A fault-tolerant disk array—RAID 1, 1E, 5, 10, and 50—goes critical when a disk drive is removed or fails. A RAID 6 or 60 disk array—goes degraded when a disk drive is removed or fails and critical when two disk drives are removed of fail.

Due to the fault tolerance of the disk array, the data is still available and online. However, once the disk array goes critical, the disk array has lost its fault tolerance, and performance may be adversely affected.

If the fault was caused by a failed drive that was removed, the drive must be replaced by another drive, either identical or larger, in order for the RAID system to rebuild and restore optimal configuration.

If your fault-tolerant disk array—RAID 1, 1E, 5, 6, 10, 50, and 60— goes offline, contact Technical Support.

130 EXCEL MERIDIAN DATA