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

NAME
The cluster name shown is a sample only.
VOLUMES
If you are not using SMS, include the VOLUMES parameter.
SHAREOPTIONS
To allow servers to share the same checkpoint data set, each server startup
job (procedure) must specify DISP=SHR in the checkpoint data set’s DD statement.
The servers serialize access to the checkpoint data set by using ENQ/DEQ.
The SEQOUT DD statement defines the sequential file that IEBDG initializes with
the initial checkpoint record.
CRRDATA Defines the sequential file that is used in this step to load the
checkpoint data set. It must be the same name you specified in the
SEQOUT DD statement.
What to Do when the Checkpoint Data Set Becomes Full
NetView FTP V2.2.1 MVS automatically deletes each checkpoint record that corresponds
to a successful file transfer. However, if many file transfers are interrupted
and not restarted, the checkpoint data set can become full. When the checkpoint
data set is full, only receiving servers conducting file transfers for which there is
already a checkpoint record in the checkpoint data set can take checkpoints—other
receiving servers cannot.
The file-transfer reports that the other receiving servers create each contain a
message indicating that the checkpoint data set is full. These messages are also
sent to the operator console to enable automated operations to commence. Refer
to message DVG670I for information about CLISTs.
If NetView FTP V2.2.1 MVS detects an overflow during a file transfer, it does not
interrupt the file transfer, but continues the transfer. However, no additional
recovery information can be stored. In the case of an interrupt, NetView FTP
V2.2.1 MVS restarts the file transfer from an earlier checkpoint or from the beginning
of the file. The NetView FTP V2.2.1 MVS report files created for each file
transfer contain an I/O error message for the NetView FTP V2.2.1 MVS checkpoint
data set, indicating the overflow condition.
When all transfers that are currently being processed have finished, the server that
detected the overflow condition automatically terminates. If all of your servers
share the same checkpoint data set you should stop NetView FTP V2.2.1 MVS
without interrupting the file transfers that are currently being processed. Otherwise
you should stop those servers that access the checkpoint data set in error.
76 NetView FTP V2 MVS Installation, Operation, and Administration