HP XP External Storage Software - Manual (Page 148)

NOTE:
The device name reported to the host is the same as the one displayed in the Device column
of the Device list. For the device names reported to the host, see Table 10 .
• Even if the status of the remote command device is normal, an error may occur when the operations
or commands are performed on the remote command device.
If an error occurs even though the status of the remote command device is normal, check the status
of the command device of the external array, not the remote command device.
• The following are restrictions for mapping command devices as remote command devices.
Table 11 Restrictions on remote command devices
Restriction Item
OPEN-V Emulation type
1 Number of LDEVs in an external LU
Disable IO Suppression mode
Disable Cache mode
96,000 blocks (about 47 MB) Minimum capacity
2 TB Maximum capacity
• External Storage XP's Discovery operation cannot identify remote command devices.
• When an external subsystem has a remote command device (that is, when a command device in
another external subsystem is mapped to this external subsystem), make sure that the remote
command device does not have the smallest LUN on the port in the external subsystem.
• You cannot execute I/Os to remote command devices.
• You cannot set command devices to disabled on remote command devices.
• You cannot set command devices' security on remote command devices.
• Do not set command devices' security on the external array side for command devices mapped
as remote command devices.
• You cannot create LUSE volumes using remote command devices.
• You cannot use Volume Manager to create CVs in remote command devices.
• Cache LUN XP is not available on remote command devices.
Mapping command devices as remote command devices
To map command devices in external arrays as remote command devices, see Mapping external LUs
(Add LU) .
Remote command devices 148