Chapter 3. Operating NetView FTP V2.2.1 MVS - IBM

If you request a restart from a checkpoint but the checkpoint record cannot be
found, NetView FTP V2.2.1 MVS does the following:
– If the requesting system is NetView FTP V2.2.1 MVS or NetView FTP for
Workstations, NetView FTP V2.2.1 MVS ends the file transfer with an error.
– If the requesting system is NetView FTP V2.1 MVS, NetView FTP VM,
NetView FTP VSE, or NetView FTP/400, NetView FTP V2.2.1 MVS restarts
the file transfer from the beginning of the data set.
Special Considerations for Using Checkpoints during a Manual
Restart of a File Transfer
You can perform a manual transfer restart from checkpoint for most errors.
However, there can be error situations, where NetView FTP V2.2.1 MVS cannot
perform exceptional checkpointing, for example, if the server subtask that processes
the file transfer terminates abnormally.
In these situations NetView FTP V2.2.1 MVS can only use the regularly written
checkpoint record when it restarts a file transfer.
If an error occurs during the transfer of a temporary data set, a restart from checkpoint
fails if the data set no longer exists.
In the following situations NetView FTP V2.2.1 MVS may not be able to close a
data set:
� The system terminates.
� The system detects an overflow condition for the data set.
� The server subtask that is performing the file transfer terminates abnormally.
Under any of these circumstances, NetView FTP V2.2.1 MVS tries to close the data
set, but special error conditions in the system can prevent it from succeeding.
When, due to an interruption, NetView FTP V2.2.1 MVS cannot close a PDS
member, the PDS directory is not updated, and so does not reflect the changes
that the transfer has effected. It is possible that, although records have been
written to a new member of a PDS, the member cannot be found after an interrupt
in the transfer. In this case a restart from the recorded checkpoint does not work.
If you encounter such a problem, submit the file-transfer request again.
When, due to the interruption, NetView FTP V2.2.1 MVS is not able to close a
VSAM data set, you may have to use the Access Method Services (AMS) VERIFY
command to close the data set manually before you let NetView FTP V2.2.1 MVS
continue the file transfer.
192 NetView FTP V2 MVS Installation, Operation, and Administration