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
ETERNUS DX
Switch
CM#1
RAID group #1
R
AID 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. 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.
2. Basic Functions
Performance Tuning
104
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
Copyright 2023 Fujitsu Limited
P3AM-7642-32ENZ0
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