Figure 2-3 Alternate Command Device Function
Remote command device
A remote command device is a command device on an external (UVM)
storage system that is mapped as a command device of the local storage
system. When commands are issued to a remote command device, the
UR/URz journal operations are processed using the UVM FC path between the
arrays. Use of a remote command device provides improved performance for
3DC configurations by providing separate paths for UR/URz journal
processing and data replication.
The remote command device (RCD) requirements are:
• Virtual Storage Platform G1000, G1500, Virtual Storage Platform F1500:
¢
RCD is required in 3DC TC/UR and 3DC TCz/URz configurations,
including intermix configurations with VSP or USP V/VM.
¢
RCD is required in 3DC URxUR and 3DC URzxURz configurations,
including intermix configurations with VSP or USP V/VM.
¢
RCD is not required in GAD 3DC delta resync (GAD+UR)
configurations.
• Virtual Storage Platform G200, G400, G600, G800 and Virtual Storage
Platform F400, F600, F800:
¢
RCD is required in 3DC TC/UR and URxUR configurations.
¢
RCD is not required in GAD 3DC delta resync (GAD+UR)
configurations.
• Virtual Storage Platform: RCD is recommended in 3DC TC/UR and 3DC
TCz/URz configurations. If there is intermix with VSP G1000, G1500 or
VSP F1500, RCD is required.
• Hitachi Unified Storage VM: RCD is recommended in 3DC TC/UR
configurations.
2-6
CCI software environment
Command Control Interface User and Reference Guide
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