True. After the instances have settled down and stabilized, the WSS of the swapless server is appreciably larger than that of the others. And yes there is a risk in doing this that I'm not willing to take in our production environments. It would be nice to *someday* be able to simply define instances with CP storage allocation and let the software take care of how its all used, maybe through better control of file and buffer caching or something.
Ray > -----Original Message----- > From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On > Behalf Of Martin, Terry R. (CMS/CTR) (CTR) > Sent: Monday, June 28, 2010 11:24 AM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Memory use question > > Hi > > Well this is not something I would do in my shop. Not having swap > available for Linux is just asking for trouble. One reason is that you > really want to size your guests in such a way that they use just a > trickle of swap this allows you to size a guest in terms of memory > defined to the guest to allow z/Linux to maximize the handling of the > memory and from a performance standpoint you really want it > to be VDISK. > > > > One of the things that makes running z/Linux under VM so appealing is > the ability to take a server running in Solaris let's say that has 20G > and cut that in half or more when it is migrated to z/Linux > under VM. To > do this you need to have flexibility when it comes to paging and > swapping for the guest. > > > Thank You, > > Terry Martin > Lockheed Martin - Citic > z/OS and z/VM Performance Tuning and Operating Systems Support > Office - 443 348-2102 > Cell - 443 632-4191 ---------------------------------------------------------------------- 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/
