Assigned Cms; Figure 60 Assigned Cms - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Performance Tuning

Assigned CMs

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

Figure 60 Assigned CMs

Switch
CM#0
Assigned
CM
RAID group #0
RAID group #2
ETERNUS DX
When the load is unbalanced between the controllers, change the assigned CM. For more details,
refer to "Change Controlling CM" in "ETERNUS Web GUI User's Guide".
If an assigned controller is disconnected for any reason, the assigned CM is replaced by another
controller. After the disconnected controller is installed again and returns to normal status, this
controller becomes the assigned CM again.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
The assigned CM of the
Switch
RAID group controls access
CM#1
Assigned
CM
RAID group #1
104
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