C-2 Adjusting Volume Capacities for Pairs
Hitachi Universal Storage Platform V/VM Universal Volume Manager User’s Guide
Notes:
• 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 Universal Volume
Manager.
• If you want to create a TrueCopy 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
TrueCopy pair.
4. Create a pair.
Select a volume that has the
same capacity as volume (B),
or select a volume that has the
bigger capacity than the volume (B).
Make CV that has the same capacity
as the volume (B), if you have
selected volume (C) that is bigger
than the volume (B).
External Volume(A) Mapped External
Volume (B)
Copy Destination
Volume (C)
Create Pair
Step1 Step 2 Step 3Step 4
Figure C-1 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 C-2.
To adjust the capacity of the external volume to create a pair:
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).