HP XP P9500 Storage - Manual (Page 87)

C Adjusting volume capacities for pairs
This appendix provides information for adjusting volume capacities for pairs.
Adjusting volume capacities
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 27 (page 87) .
To adjust the capacity of the P9500 volume to create a pair (when copying data from an external
storage system, when you want to use an external volume as a P-VOL):
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 P9500 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 P9500 volume (C) which has the 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 P9500 volume (C) using the Virtual LVI/Virtual LUN function. For the Virtual LVI/Virtual
LUN function, see the HP P9000 Provisioning for Open Systems User Guide and the HP P9000
Provisioning for Mainframe Systems User Guide.
NOTE:
•
When you make the CV that has the same capacity as the mapped external volume (B)
using the Virtual LVI/Virtual LUN 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 External Storage.
4. Create a pair.
Figure 27 Copying data from an external storage system (using an external volume as P-VOL)
For “A,” “B,” and “C” in the following description, see Figure 28 (page 88) .
To adjust the capacity of the external volume to create a pair (when copying data to an external
storage system, when you want to set an external volume as an S-VOL):
1.
Map the external volume (A) as an internal volume (B) of the local storage system. Set the
emulation type as same as that of the copy source volume (C).
2. Check the capacity of the internal volume (B) where the external volume (A) is mapped. If the
capacity of the mapped external volume (B) is not same as the copy source volume (C), use
the Virtual LVI/Virtual LUN function to create a CV that has the same capacity as the copy
source volume (C) out of the volume (B).
3. Create a pair.
Adjusting volume capacities 87