Mapping command devices as remote command devices – HP StorageWorks XP Remote Web Console Software User Manual
Page 130
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The following are restrictions for mapping command devices as remote command devices.
Table 10 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
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XP External Storage's Discovery operation cannot identify remote command devices.
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When an external array has a remote command device (that is, when a command device in
another external array is mapped to this external array), make sure that the remote command
device does not have the smallest LUN ID on the port in the external array.
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You cannot execute I/Os to remote command devices.
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You cannot set command devices to disabled on remote command devices.
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You cannot set command devices' security on remote command devices.
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Do not set command devices' security on the external array side for command devices mapped
as remote command devices.
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You cannot create LUSE volumes using remote command devices.
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You cannot use Volume Manager to create CVs in remote command devices.
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XP Cache LUN 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
.
NOTE:
Command devices that can be mapped as remote command devices are displayed on
XP External Storage's panes as shown in
.
When you select Discovery in the Device tree on the LU Operation pane, the external array's
WWNs appear. When you select an external array's WWN in the Device tree, information such
as OPEN-V-CM appears in the Device column of the Device list for command devices that can be
mapped. Select a command device that can be mapped, and follow the procedure in
to map it.
Using XP Continuous Access or XP Continuous Access Journal with remote
command devices
To use XP Continuous Access or XP Continuous Access Journal with a remote command device,
you would traditionally need two different kinds of ports: an initiator port for XP Continuous Access
or XP Continuous Access Journal, and an external port for the remote command device. However,
if you set the Initiator/External MIX mode, you can use a port as both the initiator port for XP
Continuous Access or XP Continuous Access Journal and as the external port only for remote
command device use.
Before setting the Initiator/External MIX mode, you must prepare initiator and external ports in one
port block of Standard mode. You can set the Initiator/External MIX mode on the port block
consisting of the initiator and external ports.
130 Remote command devices