HP XP External Storage Software - Manual (Page 38)

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 array.
1. From the host connected to the external array, write data to the LU in the external array.
2. Use External Storage XP to map the LU in the external array containing data as an internal LDEV
of the local 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) .
CAUTION:
You must set the emulation type to OPEN-V to read existing data in the mapped external
LU from the local array side. 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 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 array side.
3. Configure the path from the Target port to the mapped LU to perform host I/O operations.
After the path is set, host I/O operations to the mapped volume are available.
Preparing for External Storage XP operations 38