Issue the CGROUP command with the FREEZE option specified (one
command per storage control or LSS) to freeze I/O updates to the primary
volume. Freezing your secondary volume ensures that it is consistent
with the primary volume, but any updates made to the primary volume
after the freeze are not reflected on the secondary volume. To freeze
updates to the primary volume, issue the following command:
CGROUP DEVN(X'0F41') PRIM(X'A763' FCA76 X'6B' X'03') SEC(X'A762' FCA76 X'1E' X'02') FREEZE
Note: The CGROUP command enables the extended long-busy
condition when the state of the volume pair changes to the SUSPENDED
state. The application programs making updates to primary storage
controls receive a long-busy condition.
Results: When you freeze I/O updates to the
affected primary volume of an LSS pair, the following conditions occur:
- The I/O to primary and secondary volumes is temporarily queued
- The established paths between the LSS pairs are disabled
- The affected volume pair is suspended:
- SYNC volume pairs in DUPLEX or PENDING states are suspended in
a consistent state
- XD volume pairs are also suspended but in a fuzzy, nonconsistent
state.
Continue with Step 3. resume operations after a freeze.
For additional information about fuzzy volume copies, refer to Establishing PPRC volume pairs.