Manuals

In the case of redundant RAID system drives with no standby drives, if one of the physical drives fails suddenly, the DAC960PL system will continue to function without any interruption. However, in this critical period, the DAC960PL system can tolerate no further physical drive failures, as data on the drives is no longer redundant. In order to make the system redundant, the failed physical drive needs to be replaced with a functional physical drive of the same size and same SCSI ID, and the data needs to be rebuilt on this newly installed physical drive. The REBUILD option in the MAIN MENU is used for rebuilding data under this circumstance. Normally, a rebuild operation will also be supported under the DAC utilities for various operating systems and, as such, this option may not be needed.

CAUTION: Do not attempt to rebuild more than one hard-disk drive at a time (with the dacadm utility) after the operating system has been installed. Doing so could cause data corruption on all hard-disk drives in the system. Do not attempt to eject a CD ROM or tape cartridge from a drive while performing a rebuild with the Mylex utilities. Doing so may cause unpredictable results.

When REBUILD is selected in the MAIN MENU, a screen similar to Selecting a Drive for Rebuilding is displayed. It shows the drive matrix on the left-hand side. Move the cursor to the drive that needs to be rebuilt, and press <ENTER>. Normally, the drive to be rebuilt will be indicated by the letters DED (DEAD drive).

Once REBUILD starts, a screen similar to Drive Rebuilding in Progress is displayed. It shows the progress of REBUILD on the various system drives that are dependent on the selected physical drive. Once REBUILD is over, a message to that effect is displayed on the screen. A REBUILD fails if read errors are encountered on the system drive. The REBUILD BBT reports all such errors.

If an error message is displayed, the cause could be that there are no DEAD drives in the system, the DEAD drive is part of system drives that are nonredundant, or the DEAD drive has not been replaced by a functional drive at the same SCSI ID and powered on, before the utility was invoked.