HP XP External Storage Software - Manual (Page 42)

Figure 13 External LU capacity is smaller than the specified emulation type's basic capacity
• 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.
• 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 External Storage XP, select Disable. For Flex Copy
XP, select Enable.
• If you use the mapped external LU for the copy source or copy destination volume for a Flex Copy
XP pair, set the emulation type to OPEN-V when mapping the volume.
• If you use the mapped external LU for the copy source or copy destination volume for a Flex Copy
XP pair, set IO Suppression mode to Enable when mapping the volume.
• 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 Flex Copy XP 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.
• IO Suppression mode is automatically set to the same status for all LDEVs in a given external LU.
• Cache Mode is automatically set to the same status for all LDEVs in a given external LU.
• 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 StorageWorks LUN Configuration and Security Manager XP user guide for the
XP12000/XP10000/SVS200.
• 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 StorageWorks
LUN Configuration and Security Manager XP user guide for the XP12000/XP10000/SVS200.
If you format the external array's mapped LU from the external array side, data that existed prior
to formatting cannot be ensured. When using the mapped external LU from the mainframe OS,
format the mapped volume from the local array side.
Preparing for External Storage XP operations 42