How do I correct 0P78I UNKNOWN CANCEL CODE CA

Document ID : KB000055297
Last Modified Date : 14/02/2018
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Description:

May receive this error during IPL, or in a partition when a batch job runs.

Solution:

The error means that System Adapter Register Store save area was used up and the SVRB value will need to be increased. The SVRBs are used to save user PSW and registers during SVC intercept processing, and indicates the maximum concurrent intercepts at any one time.

This value may be increased online on the System Adapter Panel (CASA-1000) or by batch.

  // EXEC CACCDBU0,SIZE=100K
      ALTER SYS -
      DESC('MYSYSTEMOPTIONS')
      SVC(255) -
      SYSID(A,1) -
      SVRB(32) -
      CPU(A,FF00000130900000,B,FF00000230900000)
    /*

The SVRB has a default of 25. The maximum value allowed is 32767. The SVRB control blocks are allocated in the 24 bit system GETVIS area, it uses approximately 8k per 25 control blocks.