Compromised Fault Tolerance - Compaq N2400 - TaskSmart - 1 GB RAM Administration Manual

Advanced Administrative Procedures 6-33

Compromised Fault Tolerance

If the fault tolerance of an array is compromised due to multiple concurrent
drive failures, the condition of the logical drive or drives on that array is
"failed," and unrecoverable errors are returned to the operating system. Data
loss is probable. Inserting replacement drives at this time does not improve the
condition of the logical drive or drives.
If you encounter this situation, first try powering down the entire system and
then powering up. Then remove power from both the server and storage
enclosure. Reapply power to the storage enclosure, then the server, and then
restart the system. In some cases, a drive with intermittent problems can work
long enough for you to make copies of important files. If a 1779 POST
message is displayed, press the F2 key to re-enable the logical drive or drives.
Remember, it is likely that data loss has occurred, and any data on a failed
logical drive is suspect.
Fault tolerance can also be compromised due to nondrive issues. These issues
include faulty SCSI and power cables, power supplies, facility power, or
accidental unplugging of storage enclosure power. In such cases, the physical
drives in the storage enclosures need not be replaced. However, data loss is
possible.
In cases of actual drive failure, replace any drives that have failed to prevent
further problems. Afterwards, the fault tolerance may again be compromised,
power may need to be recycled, and the 1779 POST message may again be
displayed. Press the F2 key to re-enable the logical drive or drives. Then
recreate your pools and virtual disks, and restore data from backup media.