Understanding Drive Arrays B-25

Compaq Confidential – Need to Know Required

Writer: CDresden Project: Compaq Integrated Smart Array Controller User Guide Comments:

Part Number: 153236-001 File Name: i-appb Understanding Drive Arrays.doc Last Saved On: 8/27/99 11:35 AM

In general, the time required for a rebuild is approximately 15 minutes per

gigabyte. The actual rebuild time, however, is dependent upon the Rebuild

Priority set, the amount of I/O activity occurring during the rebuild operation,

the number of drives in the array (RAID 5) and the disk drive speed.

Automatic Data Recovery Failure

During Automatic Data Recovery, if the online LED of the replacement drive

stops blinking and all other drives in the array are still online, the Automatic

Data Recovery process may have been terminated abnormally because of a

noncorrectable read error from another physical drive during the recovery

process. The background Auto-Reliability Monitoring process is intended to

help prevent this problem, but it cannot do anything about certain issues, such

as SCSI bus signal integrity problems. Restart the system. A POST message

will confirm the diagnosis. Retrying Automatic Data Recovery may help. If

the retry does not help, the recommended course of action is a backup of all

data on the system, a surface analysis (with user diagnostics tools), and a full

restore.

During Automatic Data Recovery, if the online LED of the replacement drive

stops blinking and the replacement drive is failed (amber failure LED

illuminated or other LEDs go out), the replacement drive is producing

unrecoverable disk errors. In this case, the replacement drive should be

removed and replaced with another replacement drive.

Compromised Fault Tolerance

If fault tolerance is ever compromised because of failure of multiple drives,

the condition of the logical drive will be “failed” and “unrecoverable” errors

will be returned to the host. Data loss is probable. Insertion of replacement

drives at this time will not improve the condition of the logical drive. If this

occurs, first try turning the entire system off and on. In some cases an

intermittent drive will appear to work again (perhaps long enough to make

copies of important files) after cycling power. If a 1779 POST message

displays, press F2 to reenable the logical drive(s). Remember that data loss has

likelyoccurredandanydataonthelogicaldriveissuspect.

Fault tolerance may be compromised because of nondrive problems such as a

faulty cable, faulty storage system power supply, or a user accidentally turning

off an external storage system while the host system power was on. In such

cases, obviously the physical drives do not need to be replaced. However, data

loss can still occur in this situation, especially if the system was busy at the

time the problem developed.

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