Specifications

18 en | RAID Functions: Introduction SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
1.5.2 Manual Rebuild
When a user applies a forced-manual rebuild, the controller will first examine whether there is
any Local Spare assigned to the logical drive. If yes, it will automatically start to rebuild.
If there is no Local Spare available, the controller will search for a Global Spare. If there is a
Global Spare, logical drive rebuild will be automatically conducted.
Fig. 1.14 Manual Rebuild
If none of the spares are available, the controller will examine the SCSI channel and ID of the
failed drive. Once the failed drive has been replaced by a healthy one, it starts to rebuild using
the new drive. If there is no available drive for rebuilding, the controller will not attempt to
rebuild until the user applies another forced-manual rebuild.
1.5.3 Concurrent Rebuild in RAID (0+1)
RAID (0+1) withstands multiple drive failures with the condition that none of the mirrored
pairs of data drives fails. (Two data drives mirroring each other must not fail together)
Rebuilds can be automatically and concurrently conducted on more than one member if there
is a sufficient number of pre-configured spare drives. Rebuild can also begin when the failed
drives have been manually replaced. If failed drive detection has not been turned on, you may
need to manually initiate the process.