Controller Fan Modules - HP Surestore Disk Array 12h - And FC60 Service Manual

Controller Memory Modules
Each controller module contains SIMM and DIMM memory modules. Two 16-Mbyte SIMMs
(32 Mbytes total) store controller program and other data required for operation. The
controller includes two DIMMs, which provide 256 Mbytes of cache. Cache memory serves
as temporary data storage during read and write operations, improving I/O performance.
When cache memory contains write data, the Fast Write Cache LED, on the front of the
controller enclosure goes on. See Figure 13.

Controller Fan Modules

The controller fan module is a single removable unit containing dual cooling fans and
temperature monitoring logic. See Figure 13. It includes five LEDs that indicate overall
system status and controller fan status. The fans provide cooling by pulling air in through
ventilation holes, moving it across the controller cards, and exhausting it out the
ventilation holes in the fan assembly. The dual fans provide a redundant cooling system to
both controller modules. If one fan fails, the other continues to operate and provide
sufficient air circulation to prevent the controllers from overheating until the fan module is
replaced. The fan module plugs into a slot on the front of the controller enclosure, and has
a handle and captive screw for easy service.
Array Controller Enclosure Components
37