AMBLIST uses the system-determined block size for SYSPRINT
Description
With APAR OA46441 applied, the AMBLIST utility uses the system determined block size when it creates the SYSPRINT data set. Before APAR OA46441, AMBLIST used (by default) a block size equal to the record length for allocating the SYSPRINT data set, if the block size was not specified or was specified as 0.
Table 1 provides more details about this migration action. Use this information to plan your changes to the system.
| Element or feature: | BCP |
|---|---|
| When change was introduced: | z/OS V2R1 and z/OS V1R13, both with APAR OA46441 applied. |
| Applies to migration from: | z/OS V2R1 and z/OS V1R13, both without APAR OA46441. |
| Timing: | Before installing z/OS V2R2. |
| Is the migration action required? | Yes, if you expect the SYSPRINT data set that is created by AMBLIST to have a block size other than the system determined block size. |
| Target system hardware requirements: | None. |
| Target system software requirements: | None. |
| Other system (coexistence or fallback) requirements: | None. |
| Restrictions: | None. |
| System impacts: | If a program opens the SYSPRINT data set created by AMBLIST with DCB RECFM=FA or RECFM=FA,LRECL=121 parameters, the program is abended with message IEC141I 013-60. |
| Related IBM® Health Checker for z/OS® checks: | None. |
Steps to take
Check for JCL and programs that use the AMBLIST utility to write SYSPRINT output to a sequential data set, and ensure that block sizes are specified explicitly where appropriate. For example, suppose that a program that refers to the SYSPRINT data set expects a new SYSPRINT data set to have a block size of 121 (BLKSIZE=121). If so, you must specify this value explicitly in the SYSPRINT DD statement when you run the AMBLIST utility. For any programs that open the SYSPRINT data set with the DCB parameters RECFM=FA or RECFM=FA,LRECL=121, remove the RECFM and LRECL parameter from the DCB macro. Or, change the record format value to FBA (RECFM=FBA).
Reference information
For more information about the AMBLIST utility, see z/OS MVS Diagnosis: Tools and Service Aids.