30 External Storage XP for the XP12000/XP10000
HP StorageWorks LUN Configuration and Security Manager XP user guide for the
XP12000/XP10000.
4. Map the Target port LU to the mapped LDEV. The mapped LDEV is available for host I/O operations.
After the path is set, host I/O operations to the mapped LU are available.
Figure 9 Writing new data to mapped external LUs
Using existing data in mapped external LUs
Figure 10 shows an example of using existing data in a mapped external LU from the host connected to the
local disk array.
1. From the host connected directly to the external disk array, write data to the LU in the external disk
array.
2. Use External Storage XP to map the LU in the external disk array containing data as an internal XP
LDEV of the local disk array.
When mapping the external LU, set the following attributes for the mapped LU:
• Emulation type: OPEN-V
• IO Suppression mode: Disable
For more information, see ”Mapping external LUs (Add LU)” on page 60.
CAUTION: To read existing data in the mapped external LU using the local disk array, set the
emulation type to OPEN-V. Other emulation modes require that the data space be resized, which in
effect destroys existing data. Once an external LU is mapped to the local disk array for use by
External Storage XP, direct host access to that LU is no longer allowed. Also set the emulation type
to OPEN-V when the VMA of LUN Security XP Extension is set for the external LU on the external
disk array side.
3. Configure the path from the Target port to the mapped LU. The mapped LU is available for host I/O
operations.
After the path is set, host I/O operations to the mapped volume are available.
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