HP XP Racks - Manual (Page 20)

Base LDEV capacity (blocks) Minimum LDEV capacity (blocks) Emulation type
5,924,352 155,904 3390-3
17,617,152 155,904 3390-9
57,450,624 155,904 3390-L
114,823,296 233,856 3390-M
Adjusting volume capacities for pairs
Mapped external volumes can be used for replication. All HP XP7 Storage replication software
requires a pair’s secondary volume (S-VOL) to have the same capacity as the primary volume
(P-VOL).
If you need to adjust the capacity of the HP XP7 Storage volume or the external volume before
creating the pair, proceed as shown in the following subtopics.
Decreasing the size of the HP XP7 Storage S-VOL
When the HP XP7 Storage volume S-VOL is larger than the mapped external volume P-VOL, adjust
the HP XP7 Storage volume’s capacity as follows:
1.
Map the external volume with emulation type OPEN-V.
2. Make sure the HP XP7 Storage volume’s emulation type is OPEN-V.
3. Decrease the size of the HP XP7 Storage S-VOL by creating a custom volume (CV) using Virtual
LVI/Virtual LUN, as shown in the following figure.
Base the CV capacity on Blocks, which displays in the Capacity column on the LDEV Information
dialog box in Remote Web Console. See the HP XP7 Provisioning for Open Systems User
Guide and the HP XP7 Provisioning for Mainframe Systems User Guide for instructions on
creating CVs.
4. Create the pair.
Decreasing the size of the external volume S-VOL
When the mapped external volume S-VOL is larger than the HP XP7 Storage P-VOL, adjust the
external volume’s capacity as follows:
1.
Map the external volume with the same emulation type as the HP XP7 Storage primary volume.
2. After mapping, check the new internal volume’s capacity. If it is larger than the HP XP7 Storage
P-VOL, decrease the size by creating a CV that is the same size as the HP XP7 Storage P-VOL
using Virtual LVI/Virtual LUN (see the following figure).
20 Requirements and planning