Chapter 2: System controllers
The storage systems are equipped with dual controllers for communicating with a data
host.
Each controller includes the following internal components such as a processor, dual in-
line cache memory modules (DIMMs), cache ash memory (CFM), battery, and fans. The
controller has an Ethernet connection for out-of-band management using Hitachi Device
Manager - Storage Navigator. If the data path through one controller fails, all drives
remain available to data hosts using a redundant data path through the other controller.
The controller is equipped with LED indicators for monitoring its operating conditions
and notifying possible component replacement.
Controller chassis with small form-factor drive bays (CBSS)
The CBSS controller chassis houses controllers, backup fan modules, power supplies,
and provides twenty-four slots at the front for loading large form-factor (2.5-inch) data
drives. The chassis also includes specic functional LEDs located on the front and rear of
controller to provide its operating status.
The following table lists the controller board specications.
Component Description
Chassis (2U) DW800-CBSS
Controller board DW-F850-CTLS DW-F850-CTLSE
Number of DIMM slot 2
Cache memory DIMM
capacity
32 GiB
Total cache memory DIMM
capacity
64 GiB (per controller) 128 GiB (system)
Data encryption Not supported Supported
CBSS controller chassis with front panel bezel
The following table lists the denitions of the CBSS controller chassis front panel bezel
LEDs.
Chapter 2: System controllers
Hitachi Virtual Storage Platform G350, G370 Hardware Reference Guide 15
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