HP XP External Storage Software - Manual (Page 156)

C Adjusting the Volume Capacities for Pairs
When you create a pair, the capacity of an S-VOL must be the same as that of a P-VOL. To set a
desired volume to a pair, you may need to adjust the capacity of the volume. This section describes
the procedure for adjusting the volume capacity.
For A, B, and C in the following description, see
Figure 47 (page 156) .
To adjust the capacity of the storage system volume to create a pair (if you want to use an external
volume as P-VOL when copying data from an external storage system):
1. Map the external volume (A) as an internal volume (B) of the local storage system. Make sure
that the emulation type of the volume is OPEN-V.
2. Select the storage system volume (C) which has the same capacity as the mapped external
volume (B), or which has the bigger capacity than the mapped external volume (B). The
emulation type of the volume (C) has to be OPEN-V.
3. If you select the storage system volume (C) that has a bigger capacity than the mapped external
volume (B), make the CV that has the same capacity as the mapped external volume (B) out
of the storage system volume (C) using the VLL function. For the VLL function, see the HP
StorageWorks XP24000/XP20000 Virtual LVI/LUN (VLL) and Volume Shredder User Guide.
NOTE:
•
When you make the CV that has the same capacity as the mapped external volume (B)
using the VLL function, make the capacity of CV according to the Blocks capacity that is
displayed in the Capacity column on the LDEV Information dialog box of XP External
Storage (see
(page 85) ).
•
To create an XP Continuous Access pair with an XP1024/XP128 Disk Array or Lightning
9900C series storage system volume, you may not be able to create a CV that has the
same capacity as the mapped external volume (B) since the VLL function does not allow
you to specify the capacity in Blocks. In this case, you cannot create an XP Continuous
Access pair.
4. Create a pair.
Figure 47 Copying Data from an External Storage System (Using an External Volume as the P-VOL)
For A, B, and C in the following description, see Figure 48 (page 157) .
To adjust the capacity of the external volume to create a pair (if you want to set an external volume
as S-VOL when copying data to an external storage system):
156 Adjusting the Volume Capacities for Pairs