Maybe -- but having a real disk (and setting an alert for that) helps isolate the issue to a single guest rather than affecting critical shared resources (in this case memory/paging) when a guest starts swapping more than normal or than it 'should'.
I like the idea of having a 'failover' swap area on real disk -- whether you have a single VDISK or 2 prioritized ahead of it. I guess whether it's waste of resource depends on your POV.. But your point is taken.. Scott On Wed, Apr 29, 2009 at 4:42 PM, Barton Robinson < [email protected]> wrote: > giving real disks to swap is a real waste of resource. It is much better > to take the "extra disk resource" that you allocate but never want to use, > and assign it to z/VM paging to enhance your paging subsystem. Then define > two vdisks for swap, prioritize them, and set an alert when the 2nd disk is > being used. > > Martin, Terry R. (LOCKHEED MARTIN Performance Engineering/CTR) (CTR) wrote: > >> Hi >> >> >> I am using SWAPGEN to define by z/Linux VDISKS I also want to define a >> real disk for swap. My question is can I use SWAPGEN to define a swap on >> real DASD? If you have an example of the control card syntax to accomplish >> this that would be great? >> >> //Thank You,// >> >> >> //Terry Martin// >> >> //Lockheed Martin - Information Technology// >> >> //z/OS & z/VM Systems - Performance and Tuning// >> >> //Cell - 443 632-4191// >> >> //Work - 410 786-0386// >> >> //[email protected] <mailto:[email protected]>// >> >> >> >
