Specifications

16 en | RAID Functions: Introduction SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
Fig. 1.11 Global Spare Rebuild
In the example shown below, the members of Logical Drive 0 are 9GB drives, and the mem-
bers in Logical Drives 1 and 2 are 4GB drives.
It is not possible for the 4GB Global Spare Drive to join Logical Drive 0 because of its insuffi-
cient capacity. However, using a 9GB drive as the Global Spare Drive for a failed drive that
comes from Logical Drive 1 or 2 will bring a huge amount of excess capacity since these logi-
cal drives require 4GB only. As shown on the left, the 9GB Local Spare Drive will aid Logical
Drive 0 once a drive in this logical drive fails. If the failed drive is in Logical Drive 1 or 2, the
4GB Global Spare drive will immediately give aid to the failed drive.
Fig. 1.12 Mixing Local and Global Spares