Got it, thanks Barton! Thank You, Terry Martin Lockheed Martin - Information Technology z/OS & z/VM Systems - Performance and Tuning Cell - 443 632-4191 Work - 410 786-0386 terry.mar...@cms.hhs.gov
-----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Barton Robinson Sent: Thursday, April 30, 2009 9:44 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: SWAPGEN make sure that your oracle SGA fits into your page cache. If it doesn't, that will make you swap. Your ORACLE DBA ABSOLUTELY must be in agreement on your configuration.... Martin, Terry R. (LOCKHEED MARTIN Performance Engineering/CTR) (CTR) wrote: > Hi Barton, > > Thanks for the information. I will have two VDISKs for my z/Linux guests > already. I have found that when a z/Linux guest at least with my > workload starts to use SWAP it plows through it in no time so the extra > real disk for swap was to slow this down so that I could react quickly > to head of off running out of SWAP. In some cases with some of my Oracle > workload by the time I received the alert that the second VDISK was > being used it would have already been used up. My paging subsystem is > pretty robust as it stands and I do very little paging so far. > > Thank You, > > Terry Martin > Lockheed Martin - Information Technology > z/OS & z/VM Systems - Performance and Tuning > Cell - 443 632-4191 > Work - 410 786-0386 > terry.mar...@cms.hhs.gov > > -----Original Message----- > From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On > Behalf Of Barton Robinson > Sent: Wednesday, April 29, 2009 6:42 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: SWAPGEN > > 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// >> >> //terry.ma...@cms.hhs.gov <mailto:terry.ma...@cms.hhs.gov>// >> >> >> > >
