HP StorageWorks External Storage XP user guide for the XP12000, XP10000, SVS200 (T1706-96009, October 2007)

Figure 9 Writing new data to mapped external LUs
Using exi
stingdatainmappedexternalLUs
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 Exte
rnal 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:
•Emulati
on 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 i
n 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 em
ulation 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.
External Storage XP user guide
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