S-IOP—Specify the I/O Processor

The S-IOP keyword specifies the I/O processor that is used by EXCP channel programs.
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The S-IOP keyword specifies the I/O processor that is used by EXCP channel programs. Use this parameter to help resolve write errors that are incurred by EXCP channel programs. These write errors are indicated by messages PTQC159 and IOS000I.
If you notice degraded performance in EXCP channel programs, the channel programs may be experiencing excessive retries. Try specifying S-IOP YES.
This keyword has the following format:
S-IOP [
NO
|YES]
  • NO
    Specifies that a J-Type processor or ESCON Director is in use. EXCP channel programs write 15 tracks (one cylinder) at a time. This value is the default.
  • YES
    Specifies that an S-Type or earlier I/O processor is in use. EXCP channel programs write three tracks at a time, instead of 15 tracks (one cylinder).