GPFS: Administration and Programming Reference - IRA Home

mmfsctl Command
lunA2 FlashCopy target, PPRC source
lunB1 PPRC target
A single GPFS file system named fs0 has been defined in the primary cluster over lunA1.
1. In the primary cluster, suspend all file system I/O activity and flush the GPFS buffers
mmfsctl fs0 suspend
The output is similar to this:
Writing dirty data to disk
Quiescing all file system operations
Writing dirty data to disk again
2. Establish a FlashCopy pair using lunA1 as the source and lunA2 as the target.
3. Resume the file system I/O activity:
mmfsctl fs0 resume
The output is similar to this:
Resuming operations.
4. Establish a Peer-to-Peer Remote Copy (PPRC) path and a synchronous PPRC volume pair
lunA2-lunB1 (primary-secondary). Use the ’copy entire volume’ option and leave the ’permit read from
secondary’ option disabled.
5. Wait for the completion of the FlashCopy background task. Wait for the PPRC pair to reach the duplex
(fully synchronized) state.
6. Terminate the PPRC volume pair lunA2-lunB1.
7. If this is the first time the snapshot is taken, or if the configuration state of fs0 changed since the
previous FlashCopy snapshot, propagate the most recent configuration to site B:
mmfsctl fs0 syncFSconfig -n recovery_clust_nodelist
Location
/usr/lpp/mmfs/bin
184 GPFS: Administration and Programming Reference