HP XP External Storage Software - Manual (Page 133)

C Adjusting Volume Capacities for
Pairs
When you create a pair, the capacity of S-VOL must be the same as that of P-VOL. To set a desired
volume to a pair, you may need to adjust the capacity of volume. This section describes the procedure to
adjust the volume capacity.
• When copying data from an external storage system (when you want to use an external volume
as P-VOL)
For A, B, and C in the following description, see Figure 52 on page 133.
To adjust the capacity of the storage system volume to create a pair:
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) which has the bigger capacity than the mapped
internal 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 Virtual LVI/LUN (VLL) and Volume Shredder User’s 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 External Storage (see
“ Checking the External Volume Details ” on page 83).
Note: To create a Continuous Access pair with a volume of Lightning 9900V series storage
system or Lightning 9900C series storage system, 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 a Continuous Access pair.
4. Create a pair.
Figure 52 Copying Data from External Storage System (Using an External Volume
as P-VOL)
•
When copying data to an external storage system (when you want to set an external volume
as S-VOL)
For A, B, and C in the following description, see Figure 53 on page 134.
XP24000 External Storage Software User’s Guide 133