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Appendix E
Recovering from Drive Failure
The purpose of fault-tolerant configurations on the Smart Array 221 Controller
is to protect against data loss due to drive failure. Although the Smart Array 221
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 will be illuminated 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 G for interpretation of POST
messages).
Drive Array Advanced Diagnostics (DAAD) will list all failed drives.
An online version on DAAD is also available in Windows NT
environments.
Compaq Insight Manager can be used to detect failed drives remotely
across a network.
Writer: Karen Hale Project: Compaq Smart Array 221 Controller User Guide Comments: 388541-001
File Name: M-APPE.DOC Last Saved On: 11/5/98 12:29 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Compaq Smart Array 221 Controller User Guide
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