On Thursday, 03/25/2010 at 11:45 EDT, RPN01 <nix.rob...@mayo.edu> wrote: > Another point I?ve not seen mentioned, and I?m not sure if it?s true or not... > > Given a dedicated volume to a Linux guest, won?t the guest start only one I/O > to the device at a time, and wait for it to complete? If you break up a larger > volume into several minidisks (like a mod 27 into mod 9?s) aren?t you allowing > the z/VM multipathing to do its job more efficiently, even if you give all the > smaller volumes to the same Linux guest? > > Like I said, I may be totally off base, but this is the impression I?ve had...
Yes, PAV support allows CP to do (in your example) multiple to the same volume, but there will still be only one I/O per minidisk. (HyperPAVs work only on full-pack minidisks.) Alan Altmark z/VM Development IBM Endicott
