The Menu Interface (TSO/ISPF Panels) › Send MVS File To Another System Screen › Parameter Fields › Checkpoint Count

Checkpoint Count

Specifies the interval at which CA XCOM Data Transport takes a checkpoint (to be used to restart a suspended or failed file transfer). The length of the checkpoint interval is measured in terms of a number of blocks.

0

Specifies that CA XCOM Data Transport is to take no checkpoints.

1 to 9999

Specifies the number of blocks that form a checkpoint interval. A checkpoint is taken whenever the specified number of blocks has been transferred.

Note: If the record packing is not used, one record = 1 block.

Notes:

• Each time a checkpoint is taken, the output buffers on the receiving system are written to the disk. Making the checkpoint interval too short slows down file transfers; making it too long increases the risk of data loss. Set Checkpoint Count to at least 1000. On Token Ring, Ethernet, and other high‑speed networks, set the Checkpoint Count to the highest allowable value.
• If the receiving system is z/OS or VSE, the Checkpoint Count is a multiple of the blocking factor. For example, if the DCB attributes are RECFM=FB LRECL=80 BLKSIZE=8000, the Checkpoint Count is a multiple of 100.