HP 166207-B21 Smart Array 5300 Controller User Guide - Page 124

Minimizing Fatal System Errors During Rebuild, When RAID ADG is used

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Hard Drive Installation and Replacement • Failure of a drive that is not mirrored to any other failed drives (in a RAID 1+0 configuration) • Failure of a second drive in a RAID ADG configuration Minimizing Fatal System Errors During Rebuild When a hard drive is replaced, the controller gathers fault-tolerance data from the remaining drives in the array. This data is then used to rebuild the missing data (originally on the failed drive) onto the replacement drive. If more than one drive is removed at a time, the fault-tolerance data is incomplete. The missing data cannot then be reconstructed and is likely to be permanently lost. To minimize the likelihood of fatal system errors, take these precautions when removing failed drives: • Do not remove a degraded drive if any other member of the array is offline (the Online LED is off). In this condition, no other drive in the array can be removed without data loss. There are some exceptions: - When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be in a failed condition simultaneously (and they can all be replaced simultaneously) without data loss, as long as no two failed drives belong to the same mirrored pair. - When RAID ADG is used, two drives can fail simultaneously (and be replaced simultaneously) without data loss. - If an online spare has an unlit Online LED (it is offline), the degraded drive can still be replaced. • Do not remove a second drive from an array until the first failed or missing drive has been replaced and the rebuild process is complete. (When the rebuild is complete, the Online LED on the front of the drive stops blinking.) There are some exceptions: - In RAID ADG configurations, any two drives in the array can be replaced simultaneously. E-8 Compaq Smart Array 5300 Controller User Guide

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Hard Drive Installation and Replacement
E-8
Compaq Smart Array 5300 Controller User Guide
•
Failure of a drive that is not mirrored to any other failed drives (in a RAID 1+0
configuration)
•
Failure of a second drive in a RAID ADG configuration
Minimizing Fatal System Errors During Rebuild
When a hard drive is replaced, the controller gathers fault-tolerance data from the
remaining drives in the array. This data is then used to rebuild the missing data
(originally on the failed drive) onto the replacement drive. If more than one drive is
removed at a time, the fault-tolerance data is incomplete. The missing data cannot
then be reconstructed and is likely to be permanently lost.
To minimize the likelihood of fatal system errors, take these precautions when
removing failed drives:
•
Do not remove a degraded drive if any other member of the array is offline (the
Online LED is off). In this condition, no other drive in the array can be removed
without data loss.
There are some exceptions:
—
When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be
in a failed condition simultaneously (and they can all be replaced
simultaneously) without data loss, as long as no two failed drives belong to
the same mirrored pair.
—
When RAID ADG is used, two drives can fail simultaneously (and be
replaced simultaneously) without data loss.
—
If an online spare has an unlit Online LED (it is offline), the degraded drive
can still be replaced.
•
Do not remove a second drive from an array until the first failed or missing drive
has been replaced
and
the rebuild process is complete. (When the rebuild is
complete, the Online LED on the front of the drive stops blinking.)
There are some exceptions:
—
In RAID ADG configurations, any two drives in the array can be replaced
simultaneously.