Media Errors On A Rebuilt Disk; Temporary Degrade And Rebuild (Phoenix Feature) - NEC S1300 User Manual

Media Errors on a Rebuilt Disk

When a media error occurs on the disk being rebuilt, note the block address of the disk
and regenerate the remaining data area (partial rebuild). When the command is issued
for the block, the sense code (04/90/2x) is reported. Since the data in the block has been
lost, the following steps must be executed to restructure the data.
1. Read all the data in the relevant logical disk and save it to another disk.
2. Replace the drive module on a logical disk basis.
3. Rewrite all the data saved in Step (1).
4. Write the backup data equivalent to the lost data.
Temporary Degrade and Rebuild (Phoenix
Feature)
When a media error occurs in a disk module, the disk module is internally degraded
(temporary degrade), and the data is automatically overwritten or reassigned in the
background and then regenerated. Then the disk module is reassigned to the original
array structure upon completion of data regeneration. This feature allows the disk array
unit to use the disk module having the media error without degrade, where in a
conventional system this module would be degraded.
4-8 Maintenance and Troubleshooting
This Manual:http://www.manuallib.com/nec/s1300ug-disk-array-unit-user-guide.html
Note:
When multiple media errors are detected, a repair fault
is generated. When the area whose repair was skipped is read at the
end of the partial rebuild, a drive fault may be generated. You can
see the generation of Repair Skip with the management software.