Controllers
The controller contains a CPU, cache memory, Bootup and Utility Device (BUD), host interfaces, and drive inter-
face ports. The controller controls all operations in the
ETERNUS DX.
An ETERNUS DX has two controllers. This makes it possible for a failed controller to be replaced while the system
is running.
■
CPU
Each controller has one CPU.
■
Cache Memory
Cache memory enables high speed processing by storing frequently used data.
For a SAN environment, the maximum capacity of cache memory for each controller is 32GB for the ETERNUS
DX500 S3 and 64GB for the ETERNUS DX600 S3.
If a cache memory fails, the failed cache memory can be replaced while the system is running.
■
BUD
A BUD is non-volatile memory in which the firmware of an ETERNUS DX is registered. A BUD is used as an area to
back up data in the cache memory if a power failure occurs.
Each controller has one BUD.
If the BUD fails, the failed BUD can be replaced while the system is running.
6. Hardware Configurations
Controller Enclosure
72
FUJITSU Storage ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems
Overview
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P3AM-7702-29ENZ0
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