HP StorageWorks External Storage XP user guide (T1706-96006, June 2006)

External Storage XP user guide 145
C Adjusting volume capacity for copy pair setting
When creating a Business Copy XP or Flex Copy XP copy pair, the S-VOL’s capacity must be the same as
the P VOL. To set a copy pair’s desired volume, you might need to adjust the volume capacity. This
section describes the procedure to adjust the volume capacity.
Copying data from external arrays (using external LUs as P-VOLs)
For A, B, and C in the following description, see Figure 71.
To adjust the volume capacity to create a pair:
1. Map the external LU (A) as an internal LDEV (B) of the local array. Ensure that the volume’s emulation
type is OPEN-V.
2. Select the local array volume (C) with the same capacity as the mapped internal LDEV (B) or a bigger
capacity than the mapped internal LDEV (B). The volume’s (C) emulation type must be OPEN-V.
3. If you select the local array volume (C) with a bigger capacity than the mapped internal LDEV (B),
create the CV with the same capacity as the mapped internal LDEV (B) out of the local array volume
(C) using Volume Manager. For more information, see the HP StorageWorks LUN Configuration and
Security Manager XP user guide for the XP12000/XP10000/SVS200.
NOTE: When using Volume Manager to create a CV with the same capacity as the mapped
internal LDEV (B), specify the CV’s capacity according to the Blocks capacity displayed in the
Capacity column on the LDEV Information pane in External Storage XP (see ”Checking an external
LU’s status (LDEV Information)” on page 95).
NOTE: To create a Continuous Access XP pair with a volume of an XP1024/XP128 Disk Array,
you might not be able to create a CV with the same capacity as the internal LDEV (B) because
Volume Manager does not allow you to specify the capacity in blocks. In this case, you cannot
create a Continuous Access XP pair.
4. Create a copy pair.
Figure 71 Copying data from external arrays (using external LUs as P-VOLs)
Copying data to external arrays (setting external LUs as S-VOLs)
For A, B, and C in the following description, see Figure 72.
To adjust the external LU’s capacity to create a pair: