Checkpoint / Restart
Use this panel to specify settings related to restarting data transfers that fail when the
transfer was executed in block or compressed mode.
Before you begin, understand that FTP supports two subcommands for restarting data transfers that fail.
- For stream mode data transfers, use the srestart command to restart the data transfer.
The z/OS FTP server supports restarts in stream mode only for zFS files.
- For block or compressed mode data transfers, use the restart command to restart the data transfers.
If you want to be able to use the restart command to restart data transfers for block or compressed mode,
you must use the settings on this panel to enable the checkpoint function prior to issuing a restart.
No settings are required to issue the srestart command for stream mode and the settings on this panel
do not apply to stream mode.
Block, Compressed, and Stream Mode Information
- Block mode transmits data as a series of data blocks, preceded by one or more headers. The logical record
boundaries of the file or data set are preserved.
The data transfer type must be EBCDIC.
- Compressed is similar to block mode and transmits data as a series of data blocks,
preceded by one or more headers. The logical record boundaries of the file or data set are preserved.
The data transfer type must be EBCDIC.
Additionally, data is transmitted without repetitive characters and blanks.
- Stream mode transmits data as a stream of bytes and is efficient because data block information is not
transferred.
Steps
- If you want to use the checkpoint/restart function for failed transfers when the client is the sending site,
select, "Yes; specify the checkpoint interval (CHKPTINT):" and enter the checkpoint interval.
- If you want to use the checkpoint/restart function for failed transfers when the server is the sending site,
select "Yes" under the question "Should checkpointing occur when data is transferred from the server to the
client during a GET operation (RESTGET)?".
- If you select to enable the checkpoint/restart function,
select the high level qualifier for the required checkpoint file.
You have completed this panel after indicating whether you want to enable the checkpoint/restart function and
entering the checkpoint interval.
You can find more detailed help on the following elements of this window:
Should checkpointing occur when data is transferred from the client to the server during a PUT operation?
Records
Should checkpointing occur when data is transferred from the server to the client during a GET operation (RESTGET)?
Checkpoint data will be stored in a file with a low level qualifier of FTP.CHECKPOINT. Select the high level qualifier (CHKPTPREFIX)
Push buttons
Click OK to complete the specification.
Click Cancel to negate any entries you have made on this page.
Click Help to understand more about this panel.