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
ETERNUS DX
Switch
CM#1
RAID group #1
RAID group #0
Switch
RAID group #2
CM#0
Assigned
CM
The assigned CM of the RAID
group controls access
Assigned
CM
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.
2. Basic Functions
Performance Tuning
105
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
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