Figure 8 shows the airflow through the storage subsystem.
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w Airflo
Figure 8. Airflow through the storage subsystem
Battery units
Each RAID controller contains 512 MB of cache memory (or more, if you have upgraded the memory). It also contains a sealed, rechargeable lithium ion battery that maintains data in the cache for up to 3 days in the event of a power failure.
Figure 9 shows the locations of the battery and memory cache DIMM in the controller.
Memory cache DIMM
Host adapter or filler panel
Battery connector
Memory cache battery
Captive fastener
Figure 9. Battery unit
The battery chargers in the power supplies perform a battery test when the storage subsystem is started and on a regularly scheduled interval thereafter. Data caching starts after the battery tests are completed.
The condition of the battery is indicated by an LED on the rear of the controller (see “Controller LEDs” on page 53 for the location of the battery fault LED and conditions that the LED indicates).
Software and hardware compatibility and upgrades
The latest DS3200 controller firmware and NVSRAM, the storage expansion enclosure (drive enclosure) ESM firmware, and the hard disk drive firmware must be installed to ensure optimal functionality, manageability, and reliability.
