CHKPTFLUSH (FTP client) statement
If FTP saves checkpoint information in the checkpoint file or data set, z/OS® might buffer the records in volatile storage instead of writing the data to storage media immediately. Use the CHKPTFLUSH statement to specify whether FTP forces z/OS to flush checkpoint information to storage media when each record is written, or allows z/OS to determine when checkpoints are flushed from volatile storage to storage media.
Guideline: When you allow z/OS to buffer checkpoint records,
if you configure a large checkpoint interval and your operator cancels
a file transfer operation when check pointing is active, you might
lose most or all of the checkpoint data. This is because z/OS cannot flush buffered data to storage media
when the FTP job is canceled. If you lose most or all of the checkpoint
data, you cannot restart the file transfer from the point where it
is interrupted. This is inefficient for long running file transfer
operations. Code CHKPTFLUSH TRUE if this is a problem at your installation.
Syntax
Parameters
- FALSE
- z/OS is allowed to buffer checkpoint records in volatile storage when FTP saves them. z/OS determines when to flush buffered records to storage media. This is the default value.
- TRUE
- z/OS flushes checkpoint records to storage media as soon as FTP saves them.
Examples
z/OS flushes checkpoint records to storage media as soon as FTP saves them.
CHKPTFLUSH TRUEUsage notes
None