Bosch DIVAR IP 6000 1U Installation Manual page 39

DIVAR IP 6000 1U
- 2 disks missing
- 2 disks "foreign configuration" or "unconfigured good"
The rebuild only could start, when the other three disks were online before: the rebuild disk is
"first fail", degraded RAID was rebuilding. "Foreign" disk is the "second fail" disk, one of the
disks, from which the parity data was copied to the rebuilding disk before the crash.
If in "degraded" mode, the surviving disks was still used, a "parity – inconsistency" between
the first failed (first fail) and the second failed disk occurs. But a RAID 5 is not usable when a
second disk fails, so no inconsistency can exist.
If you try to restore the RAID, the first fail disk could be used for rebuild later (or a new disk).
But the "second failed" disk must be used for hopefully get the offline RAID degraded again.
Two tools are useful to analyze what happened:
- the Event Viewer in the Controller Bios Utility
- the MegaCLI, a Command-Line Utility
How to use the Event Viewer in the Controller Bios Utility
Click on an event in the main screen; choose "physical" or "virtual drive" and an event class
(informational, warning, critical or fatal); start at an appropriate sequence number (minus a
few hundred), choose the number of events.
Bosch Sicherheitssysteme GmbH Installation manual
Appendix | en 39
2014.01 | V2 | DOC