z/OS is only using about half the subchannels that you defined (to mitigate path busy conditions). I don't think you have a subchannel issue. Your sync times are very nice. Your async times are horrific. That is most likely the problem. Async completion time is influenced by such things as distance to the CF, processing time in the CF, and the time it takes z/OS to become aware of and process the request completion. The good sync times push me towards thinking that the issue is with back end completion on the z/OS host side. I'd look at things that would influence the ability of the z/OS host to process work. Shared CPs? Appropriate LPAR weights? that sort of thing. If running on zBC12/zEC12 or later hardware, I'd make sure that the XCF functions switch for COUPLINGTHININT is ENABLED.
Mark A Brooks z/OS Sysplex Development ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
