It depends. From a response time perspective, the bulk of the difference is dependent on the hardware. FICON/FCP to DS8000 both will likely give similar response time. Processor time, particularly in a virtualized environment will vary significantly. See http://www.vm.ibm.com/perf/reports/zvm/html/520lxd.html
In general on system z, FCP has three areas of potential advantage: 1. avoids overhead of converting from block to eckd and back to block oriented in the CU. 2. more I/Os can be executed in parallel (though PAV is a method for ECKD to minimize this advantage) 3. more data can be moved in a single I/O command Workloads are impacted differently by the above. There are also a number of non-performance related differences. Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
