Dear Friends, I have been testing on a 2098-A01 processor. The system under test is an IDMS CV running under zVSE 4.2.2 and zVM 5.4. The test has taken the form of running on-line IDMS transactions and batch jobs and using a watch to record the response time. The data is on a 2105-800 shark connected by long-wave FICON channels. One test which was undertaken produced counter-intuitive results as follows: The 2105 was connected to the processor by one long-wave FICON channel. A series of tests were run and response times recorded. At the conclusion of the tests, a second long-wave FICON channel was physically connected by the IBM SSR and varied on-line. Within 2 minutes of varying the second FICON channel on-line, the tests of the online transactions and batch jobs was re-run. Neither VM nor VSE were re-ipled before commencing the second test. In the test with two channels, on-line response time and batch run times increased by roughly 50%. Intuitively, I would have anticipated no change or perhaps a slight drop in run times. VM minidisk cache was enabled for both tests. I am unable to explain the variance between the two tests. I have had the SSRs check the processor and shark and they can find no problems with the hardware. Can anyone suggest a possible explanation? Sincerely Nigel Salway
