FDRPAS on a single system

Single system operation

When only a single z/OS system image (CPU or LPAR) can access the source volume to be moved, FDRPAS operation is simple:

  • Start an FDRPAS SWAP task for each source volume to be moved, specifying an offline DASD volume as the target device. The SWAP task also acts as a MONITOR task.
  • FDRPAS copies tracks from the source volume to the target device.
  • During the copy, FDRPAS monitors all I/O operations to the source volume and notes all tracks that have been updated. Updated tracks are copied (or re-copied, if they were previously copied) to the new device.
  • When the copy is complete or the number of tracks remaining to be copied is below a threshold, FDRPAS quiesces all I/O to the source volume. The remaining tracks, if any, are copied while all other I/O is quiescent. At this point, the target device is an exact copy of the source volume.
  • FDRPAS swaps all system pointers so that all future I/O to the volume is directed to the target device. The original device is placed offline and the volume label on that device modified so that it cannot be accidentally placed online.
  • I/O to the volume is re-enabled and the FDRPAS SWAP task terminates.
Warning

You must be sure that the volume being swapped is not online to any other system or LPAR. If it is, you must treat this as a multi-system swap as described in Multi-System Operation.


 

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