IST1122I

Explanation
 VTAM® issues
this message in response to one of the following commands:  MODIFY CHKPT
MODIFY CHKPT,ALL
MODIFY CHKPT,DIR
MODIFY CHKPT,TOPO
Z NET
Z NET,QUICK

 This message confirms that VTAM was
unable to write either the APPN directory database or the APPN topology
database to the specified datasetname.
 code indicates
the reason for the error and is one of following:  Code
Error
1
Insufficient storage.
2
The disk file is undefined.
3
A MODIFY CHKPT command was attempted before the initial database
load was complete.
4
Disk I/O errors occurred. These errors may be reported in a separate
messages issued prior to this message.
5
A Z NET or Z NET,QUICK command may have been entered before the
initial database load was complete.  Or, the disk I/O subtask is unavailable
due to a previous abend or initialization error and termination processing
has begun.
6
The MODIFY CHKPT command was not entered at a network node.
7
The APPN directory contains no resources to checkpoint. 
10
The topology and routing services task abended while attempting
to process the MODIFY CHKPT command.

System action
 Processing continues.

Operator response
  Code
Response
1
Issue the DISPLAY STORUSE command to display storage usage for
storage pools. Message IST981I displays total VTAM private storage information. If this message
does not appear in the display, you may need to reissue the DISPLAY
STORUSE command, specifying a higher value for the NUM operand. See z/OS Communications Server: SNA Operation for additional information.  Save the
system log and dump for problem determination.

2
Save the system log for problem determination.
3
If you entered a MODIFY CHKPT command, wait a short time and reenter
the command.
4
Save the system log and dump for problem determination.
5
Regardless of how termination processing began, do not attempt
another checkpoint. If you did not enter a termination command, save
the system log and dump for problem determination.
6
VTAM ignores the MODIFY
CHKPT command because it was not entered at a network node.  Ensure
that you are working with a network node and reenter the command. 
7
None.
10
Save the system log and dump for problem determination.

System programmer response
  Code
Response
1
Increase storage as required.  See z/OS Communications Server: SNA Operation for
more information on the DISPLAY BFRUSE and DISPLAY STORUSE commands.
See the z/OS Communications Server: SNA Diagnosis Vol
1, Techniques and Procedures for additional information.
 See the z/OS Communications Server: SNA Diagnosis Vol
2, FFST Dumps and the VIT for information about analyzing dumps and
about analyzing storage using the VIT analysis tool, if external trace
is active.

2
You must define the missing disk file. See the applicable sequential
access method documentation and the z/OS Communications Server: SNA Network Implementation
Guide for
additional information.
3
None.
4
See the applicable sequential access method documentation for
more information.
5
Use the messages issued prior to this message to determine the
cause of the failure.  This message is only informing you that the
directory services or topology routing services database was not written
to datasetname. VTAM can
continue without the disk I/O subtask, but the checkpoint function
will not be available.
6
None.
7
None.
10
Review the contents of the system dump to determine the correct
problem determination action. See the z/OS Communications Server: SNA Diagnosis Vol
1, Techniques and Procedures for information on the abend procedure.

Routing code
 2

Descriptor code
 5 