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7-2 Remote Command Devices
Hitachi Universal Storage Platform V/VM Universal Volume Manager User’s Guide
Overview of Remote Command Devices
A remote command device is a device in the local storage system to which a
command device in the external storage system is mapped.
As you send the CCI commands to the remote command device, you can enter
these CCI commands to the command device of the external storage system
to operate the CCI in the external storage system.
Figure 7-1 shows an example. The OPEN host that is connected to the local
storage system sends the CCI commands of ShadowImage or TrueCopy to the
remote command device, and this means that the commands are entered to
the command device in the external storage system to operate the
ShadowImage pair or the TrueCopy pair in the external storage system.
For detailed information about CCI and the command device, see the
Command Control Interface User and Reference Guide.
Open-system Host
CCI
Remote Command
Device
Connected by
Open Fibre
Mapped as
Remote Command Device
TrueCopy Pair
ShadowImage Pair
: Remote command device
: Command device
: Logical device
: CCI commands
Local Storage System
External Storage System
Connected by
Open Fibre
Legend
: Lines showing the concept of mapping.
Connected by
Open Fibre
Figure 7-1 Outline of Remote Command Device