User's Manual

Hard Drive Installation and Replacement
E-2 HP Smart Array 641/642 Controller User Guide
HP CONFIDENTIAL
Writer: John Turner File Name: m-appe hard drive installation & replacement
Codename: darkmatter - antimatter Part Number: 309311-001 Last Saved On: 11/7/02 5:07 PM
• RAID ADG configurations can tolerate simultaneous failure of two drives.
If more hard drives fail than the fault-tolerance method allows, fault tolerance is
compromised and the logical drive fails. In this case, all requests from the operating
system are rejected with unrecoverable errors. The “Compromised Fault Tolerance”
section discusses possible ways to recover from this situation.
Recognizing Drive Failure
The LEDs on the front of each hard drive are visible through the front of the server or
external storage unit. When a drive is configured as a part of an array and attached to
a powered-up controller, the status of the drive can be determined from the
illumination pattern of these LEDs.
Table E-1 describes the meaning of the various LED combinations.
1
2
3
Figure E-1: Hard drive status LED indicators