On Tue, Mar 20, 2012 at 09:15:11AM +0100, Rob van der Heij wrote: > As for multi-pathing etc, I'm not sure that is a definite must-have > for everyone. I have seen several configurations where multi-pathing > and PAV made things slower. The issues to make this work well for real > life workload are not trivial. I'm currently looking at an ECKD device > that I can read at 250 MB/s (single device, no PAV). With a lot of > workloads this means disk I/O is not the limiting factor and you can > invest your time on other things.
Out of curiosity: That 250 MB/s is sequential read, not random read, right I found the advantage of PAV over single ECKD pretty severe with random read workloads. Kind regards, Philipp Kern ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
