HP XP External Storage Software - Manual (Page 102)

Table 19 Restrictions on Remote Command Device
Item Restriction
Emulation type OPEN-V
Number of LDEVs in an external volume 1
Cache mode Disable
Minimum capacity 96,000 Blocks (about 47 MB)
Maximum capacity 2 TB
• The remote command device cannot be identified by the Port Discovery or Volume Discovery
of External Storage.
• You cannot execute I/Os to the remote command device.
• You cannot set the command device disable on the remote command device.
• You cannot set the command device security on the remote command device.
• Do not set the command device security on the external storage system side for the command
device that is mapped as a remote command device.
• You cannot create a LUSE volume using a remote command device.
• You cannot create CVs using the VLL function in the remote command device.
• Cache Residency Manager is not available on the remote command device.
Mapping a Command Device as a Remote Command Device
The command devices that can be mapped as remote command devices are displayed in the Device
column of the Volume Operation window as shown in Table 18 on page 101.
To map a command device, select a command device that can be mapped and follow the procedure in
the section “ Mapping an External Volume Automatically ” on page 69.
Using Continuous Access or Continuous Access Journal with
Remote Command Device
When you want to use Continuous Access or Continuous Access Journal with a remote command
device, you need two different kinds of ports, which are an initiator port for Continuous Access or
Continuous Access Journal and an external port for the remote command device. However, if you set the
Initiator/External MIX mode, you will be able to use a port as both initiator port for Continuous Access or
Continuous Access Journal and external port only for the remote command device.
Before you set the Initiator/External MIX mode, you need to prepare initiator ports and external ports in
one port block of the Standard mode. You can set the Initiator/External MIX mode on the port block that
consists of the initiator ports and external ports.
Figure 47 on page 103 shows difference between the Standard mode and Initiator/External MIX mode.
When the Standard mode is set to the ports, you have to connect the cables for both initiator port and
external port. However, if you set the Initiator/External MIX mode, you just need to connect one cable,
and you can use Continuous Access or Continuous Access Journal and remote command device.
For detailed information on the port block and setting the Initiator/External MIX mode, see the HP
StorageWorks XP24000 LUN Manager User’s Guide.
102 Remote Command Devices