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H-6 Recovering from Drive Failure
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: O-APPH.DOC Last Saved On: 12/7/98 1:47 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Compromised Fault Tolerance
If fault tolerance is 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. Inserting 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 is displayed, press F2 to re-enable
the logical drive(s). Remember that data loss has likely occurred and any data
on the logical drive is suspect.
Fault tolerance may be compromised due to non-drive problems such as a faulty
cable, faulty storage system power supply, or an end user accidentally turning
off an external storage system while the host system power was on. In such
cases, the physical drives do not need to be replaced. However, data loss can
occur, especially if the system was busy at the time the problem happened.
In cases of “legitimate” drive failure, once copies of important data have been
made (if possible), replace any drives that have failed to prevent further drive
problems in the future. After these (multiple) drives are replaced, fault tolerance
may again be compromised, power may need to be cycled, and the 1779 POST
message may again be displayed. Press F2 to re-enable the logical drive(s),
recreate your partitions, and restore all data from backup.
Because of the risk that fault tolerance may be compromised at some point in
the future, make regular backups of all logical drives.