Assigned Cms; Figure 63 Assigned Cms - Fujitsu ETERNUS DX500 S4/DX600 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 63 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.
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 DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
The assigned CM of the RAID
Switch
group controls access
CM#1
Assigned
CM
RAID group #1
105
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