HP StorageWorks XP Remote Web Console Software - Manual (Page 33)

Figure 13 External LU capacity is smaller than the specified emulation type's basic capacity
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IO Suppression mode can only be selected when the volume being mapped is set to the
OPEN-V emulation type. If a different emulation type is set, IO Suppression mode is
automatically set to Disable.
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If you use the mapped external LU from the host connected to the local array, set the IO
Suppression mode to Disable when mapping the LU. For XP External Storage, select Disable.
For XP Flex Copy, select Enable.
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If you use the mapped external LU for the copy source or copy destination volume for an XP
Flex Copy pair, set the emulation type to OPEN-V when mapping the volume.
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If you use the mapped external LU for the copy source or copy destination volume for an XP
Flex Copy pair, set IO Suppression mode to Enable when mapping the volume.
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The local array does not force the external array to reserve the mapped external LU. Therefore,
do not write directly to an external array LU (that is, without writing via the local XP array)
with IO Suppression mode set to Disable from the external array side.
If XP Flex Copy operations are in progress for a volume with IO Suppression mode set to
Enable, be careful when updating data in that external LU from the external array side.
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IO Suppression mode is automatically set to the same status for all LDEVs in a given external
LU.
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Cache Mode is automatically set to the same status for all LDEVs in a given external LU.
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If you set an open-system emulation type (such as OPEN-V) when mapping the external LU,
you can use the external LU immediately.
To optionally initialize the LU's data area, use Volume Manager to format the LU. For
instructions, see the HP XP LUN Configuration and Security Manager user guide: HP XP12000
Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System.
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If you set a mainframe-system emulation type (such as 3390-3) when mapping the external
LU, format the LU or perform the Write to Control Blocks operation to make the volume usable.
After the mapping operation, the mapped LU's status is Blockade. Use Volume Manager to
format the volume or perform the Write to Control Blocks operation to make the volume usable.
◦ If you mapped a volume that has already been zero-formatted on the external array side,
perform the Write to Control Blocks operation.
◦ If you mapped a volume that has not been zero-formatted on the external array side,
format the volume on the local array side.
For instructions on the formatting and Write to Control Blocks operations, see the HP XP LUN
Configuration and Security Manager user guide: HP XP12000 Disk Array, HP XP10000 Disk
Array, HP 200 Storage Virtualization System.
Limitations on XP External Storage operations 33