Specifications

SCSI to SATA RAID Subsystem | Administrator’s Manual Firmware Functionality Specifications | en 193
Bosch Security Systems F.01U.027.802 | V1 | 2006.11
14.6 Redundant Controller
Active-active redundant
controller
Supported
Synchronized cache Supported. Through one or multiple, dedicated synchroniz-
ing channels on a common backplane or external cabling.
Synchronized cache over SCSI channels, Fibre loops, or
SATA channels is supported.
Synchronized cache can be disabled when using write-
through mode in a redundant controller configuration to
prevent performance trade-offs.
Write-back cache enabled in
redundant controller mode
Yes, with synchronized cache connection between control-
lers.
Automatic failover Yes (user's interaction necessary)
Automatic failback Yes (user's interaction necessary)
Controller hot-swap
• No need to shut down the failed controller before
replacing the failed controller.
• Support online hot-swap of the failed controller. There
is no need to reset or shutdown the failed controller.
One controller can be pulled out during active I/Os to
simulate the destructive controller failure. (Customer's
design-in hot-swap mechanism necessary)
Parity synchronization in
redundant controller write-
back mode to avoid write-hole
Supported.
Redundant controller
communication over Fibre
loops
Dedicated loops or distribution over drive loops selectable
No single-point-of-failure Supported.
Automatic engagement of
replacement controller
Supported.
Dynamic cache memory
allocation
Yes. Cache memory is dynamically allocated, not fixed.
Environment management Supported. SAF-TE, S.E.S., and on-board controller voltage/
temp monitor are all supported in both single and redun-
dant controller mode. In the event of controller failure, ser-
vices can be taken over by the surviving controller.
Cache battery backup Supported. Battery backup modules support cached data
during a power outage in both single controller and redun-
dant controller modes.
Load sharing Supported. Workload can be flexibly divided between differ-
ent controllers by assigning logical configurations of drives
(LDs/LVs) to different controllers.
Require a special firmware for
redundant controller?
No.