You can expand the capacity of DP-VOLs used as pair volumes when a TC pair is used with SI. This procedure provides an example for expanding the DP-VOL capacity in a configuration where the SI L1 pair and L2 pair are created for each volume of the P-VOL and S-VOL in the TC pair. For the detailed procedures for verifying the differential data management method, expanding the capacity, and verifying the expansion during the following procedure, see Expanding DP-VOL capacity used in TrueCopy pair .
- A V-VOL to be expanded is not an external volume.
- The LDEV format is being performed on a V-VOL to be expanded.
- A pool containing a V-VOL to be expanded meets any of the following
conditions:
- Normal condition
- The used capacity of the pool does not exceed the threshold
- The pool is not being shrunk
- When using GAD, TC, or UR, make sure that there is enough software license capacity for the page capacity assigned to the expanded volume capacity before the expansion.
- A V-VOL to be expanded is created on a valid storage system. See Expanding DP-VOL capacity while keeping pair status.
- Ensure that the numbers of differential tables and pair tables required after the expansion do not exceed the maximum number allowed on the storage system. For information about calculating the number of tables, see Calculating the numbers of differential and pair tables for each pair.
-
Expand each volume capacity, and then verify that the expansion is complete in
the expansion order shown in the following figure.
After expanding the first volume capacity (S-VOL in the TC pair), if you cannot expand the DP-VOL capacity in the SI pair, you cannot expand the P-VOL capacity in the TC pair, or resynchronizing the TC pair, make sure to perform the recovery procedure described in Recovering from failure if one volume capacity in TrueCopy pair cannot be expanded.