Dot Hill Systems SANnet II 200 - Manual (Page 27)

No single-point-of-failure Supported
Automatic engagement of replacement
controller Supported
Dynamic cache memory allocation Supported
Cache memory is dynamically allocated, not fixed.
Environment management Supported
SAF-TE, S.E.S., ISEMS (I
2 C interface), and onboard controller
voltage/temp monitor are all supported in both single and
redundant controller mode. In the event of controller failure,
services can be taken over by the existing controller.
Cache battery backup Supported
Battery backup solutions for cache memory are supported in both
single controller and redundant modes.
Load sharing Supported
Workload can be flexibly divided between different controllers by
assigning logical configurations of drives (LDs/LVs) to different
controllers.
User-configurable channel mode Supported
Channel modes configurable (SCSI) as HOST or DRIVE in both
single controller and redundant controller mode.
Redundant controller firmware upgrades Supported
Firmware upgrade can be downloaded to the primary controller
and then be adopted by both controllers, without interrupting host
I/O.
Redundant controller firmware
synchronization Supported
In the event of controller failure, a replacement controller running
a different version of firmware can restore a redundant array with
a failed controller. Different firmware versions can be auto-
synchronized later.
Data Safety
Regenerate parity of logical drives Supported
Can be performed periodically by the user to ensure that bad
sectors do not cause data loss in the event of drive failure.
Bad block auto-reassignment Supported
Automatic reassignment of bad block
Battery backup for cache memory Supported
The battery backup solutions provide long-lasting battery support
to the cache memory when power failure occurs. The unwritten
data in the cache memory can be committed to drive media when
power is restored.
Verification on normal writes Supported
Performs read-after-write during normal write processes to ensure
data is properly written to drives.
Verification on rebuild writes Supported
Performs read-after-write during rebuild write to ensure data is
properly written to drives.
Verification on LD initialization writes Supported
Performs read-after-write during logical drive initialization to
ensure data is properly written to drives.
27