HP G2 User Manual download pdf (Page 81)

Troubleshooting 81

Factors to consider before replacing hard drives

• In systems that use external data storage, be sure that the server is the first

unit to be powered down and the last to be powered back up. Taking this

precaution ensures that the system does not erroneously mark the drives as

failed when the server is powered up.

• If you set the SCSI ID jumpers manually:

– Check the ID value of the removed drive to be sure that it corresponds to

the ID of the drive marked as failed.

– Set the same ID value on the replacement drive to prevent SCSI ID

conflicts.

Before replacing a degraded drive:

• Open HP SIM and inspect the Error Counter window for each physical drive

in the same array to confirm that no other drives have any errors. (For details,

refer to the HP SIM documentation on the Management CD.)

• Be sure that the array has a current, valid backup.

• Use replacement drives that have a capacity at least as great as that of the

smallest drive in the array. The controller immediately fails drives that have

insufficient capacity.

To minimize the likelihood of fatal system errors, take these precautions when

removing failed drives:

• Do not remove a degraded drive if any other drive in the array is offline (the

Online LED is off). In this situation, no other drive in the array can be

removed without data loss.

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 the offline drive is a spare, the degraded drive can be replaced.

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HP G2 User Manual Page 81