HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 94

Recognizing Drive Failure, D-1, Hard drive status LED indicators

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Hard Drive Installation and Replacement • RAID 1+0 configurations can tolerate multiple drive failures as long as no failed drives are mirrored to one another. • RAID 5 configurations can tolerate one drive failure. • 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 will be 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-on controller, the status of the drive can be determined from the illumination pattern of these LEDs. Table D-1 describes the meaning of the various LED combinations. 123 Figure D-1: Hard drive status LED indicators D-2 Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache User Guide

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Hard Drive Installation and Replacement
D-2
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache User Guide
•
RAID 1+0 configurations can tolerate multiple drive failures as long as no failed
drives are mirrored to one another.
•
RAID 5 configurations can tolerate one drive failure.
•
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 will be 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-on controller, the status of the drive can be determined from the
illumination pattern of these LEDs. Table D-1 describes the meaning of the various
LED combinations.
1
2
3
Figure D-1:
Hard drive status LED indicators