IBM Support

DY47403 and DY47407 recommended to fix z/VSE 4.3 and 5.1 performance and related problems

Technote (troubleshooting)


After upgrading to z/VSE V4.3 or z/VSE V5.1, you might encounter unsatisfactory terminal response times in CICS because CICS does not get control, or see a performance degradation with the use of compressed files. You might also see incorrect statistics from various monitoring tools, such as WAITS and VSAM response times of zero. And, some DL/I monitoring tools might not capture any data due to certain I/O EXCPADs not being driven.

Resolving the problem

Even if you are not aware of any performance problems in CICS Transaction Server for VSE/ESA (CICS TS) V1.1.1, you are encouraged to apply the PTF for your release of z/VSE:

  • DY47403 - PTF UD53855 for z/VSE V4.3
  • DY47407 - PTF UD53867 for z/VSE V5.1

Additional details on the problems that these z/VSE PTFs fix:
  • EXCPAD not being called for CICS file control put (FCP) requests like GET and PUT, with any product that use EXCPAD
  • EXCPAD not being called for control interval (CI) access like DL/I and possibly DB2/VSE
  • Excessive CPU usage for compressed VSAM files (mostly batch)
  • An abend 2C5 (abend2C5) due to SVC 50 (X'32'), cancel task, being called when EXCPAD is busy but is needed again

Product Alias/Synonym


Document information

More support for: CICS Transaction Server

Software version: 1.1.1

Operating system(s): z/VSE

Reference #: 1610136

Modified date: 07 September 2013

Translate this page: