Assigned Cms; Figure 5.19 Assigned Cm - Fujitsu ETERNUS DX80 S2 Overview

Chapter 5 Basic Functions
5.5 Operation Monitoring
5.5.4

Assigned CMs

A controller that controls access is assigned to each RAID group and manages the load balance in the
ETERNUS DX Disk storage system. The controller that controls a RAID group is called an assigned CM.

Figure 5.19 Assigned CM

Switch
Assigned
RAID group#0
RAID group#2
ETERNUS DX Disk storage system
If auto assignment is selected for an assigned CM when RAID groups are created, the RAID group number is
used to determine the assigned CM. When the RAID group number is an even number, "CM#0" is allocated as
the assigned CM. For odd numbers, "CM#1" is allocated. When the load is unbalanced between the controllers,
change the assigned CM.
Switch
CM#0 CM#1
Assigned
CM CM
RAID group#1
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED
The assigned CM of the
RAID group controls
access.
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