Battery Units; Software And Hardware Compatibility And Upgrades; Software And Firmware Support Code Upgrades; Power Supply Components - IBM DS3500 Installation, User & Maintenance Manual

Figure 9. Power supply components

Battery units

Each RAID controller contains 1024 MB of cache memory (minimum). It also
contains a sealed, rechargeable lithium ion battery that maintains data in the cache
so that it can be transferred to flash memory in the event of a power failure.
Figure 10 shows the locations of the battery and memory cache DIMM in the
controller.
Battery connector
Figure 10. 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 75 for the location of the battery fault LED and
conditions that the LED indicates).

Software and hardware compatibility and upgrades

The latest controller firmware, NVSRAM firmware, ESM firmware, and hard disk
drive firmware must be installed to ensure optimal functionality, manageability, and
reliability.

Software and firmware support code upgrades

To enable support for the DS3500, you must make sure that your system software
and firmware are at the latest levels. To find the latest DS Storage Manager
software, controller firmware, NVSRAM, ESM firmware, and hard disk drive
firmware, check the firmware readme files.
Power
connector
Host adapter
or filler panel
Memory cache battery
Captive fastener
Power Power
switch connector
Memory
cache DIMM
Power
switch
11
Chapter 1. Introduction