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SMART-2DH Array Controller Reference Guide
Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002
File Name: N-APPG.DOC Last Saved On: 2/27/98 12:09 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Appendix G
Recovering from Drive Failure
The purpose of fault-tolerant configurations on the SMART-2DH Array
Controller is to protect against data loss due to drive failure. Although the
SMART-2DH Array Controller firmware is designed to protect against normal
drive failure, it is imperative that the system operator perform the correct
actions to recover from a drive failure without inadvertently inducing any
additional drive failures. Multiple drive failures in the same array generally
result in data loss (exceptions include failures following activation of a spare
drive, and failure of drives in a mirroring configuration that are not mirrored
to one another).
Recognizing a Drive Failure
A drive failure can be recognized by the system operator in one of several ways:
■
Amber LED will be illuminated on failed drives in a hot-pluggable
tray. This, however, assumes the storage system is powered-on and the
SCSI cable is working. Note that the amber LED may be illuminated
briefly when a hot-pluggable drive is inserted; this is normal.
■
Amber LED will be illuminated on the front of a ProLiant Storage
System if failed drives are inside (other problems such as fan failure or
over-temperature conditions will also cause this LED to be
illuminated).
■
A Power-On Self-Test (POST) message will list failed drives whenever
the system is restarted (assumes that one or more “good” drives are
detected by the controller). (See Appendix E for interpretation of POST
messages).
■
Drive Array Advanced Diagnostics (DAAD) will list all failed drives.
An online version on DAAD is also available in NT environments.
■
Compaq Insight Manager can be used to detect failed drives remotely
across a network.