Dear all, I would like to support the idea of having a command that actively empties a used page volume. Well, I don't really need to see which guest is using which page volume but in case I am draining a volume there should be an option to move the allocated pages to an active volume.
Last year, we were replacing some of our DS8000s with a DS8700s and so I had to move nearly all VM-volumes. Moving the guest and user volumes and dynamically change disk addresses etc. was not a big deal. For our clusters I didn't had any downtime since i could recycle one node after the other. Very dynamic process. However I could not move some of the page volumes because there were pages in use. And that required then an IPL. For empty page volumes the drain is good but for active volumes does not help really. Kind regards, Florian On Tue, Jun 14, 2011 at 6:19 PM, Scott Rohling <scott.rohl...@gmail.com>wrote: > Nope - issuing a DRAIN is really the only option. In my experience - it > almost always requires an IPL to completely get it clear. DRAIN does not > actively move pages -- it simply prevents any CP from writing any new ones > on it. It's pretty standard to have to wait until the next maintenance > window to reclaim drained volumes. > > Scott Rohling > > On Tue, Jun 14, 2011 at 9:56 AM, Nelson, Gene C. <gcnel...@fedins.com > >wrote: > > > We ran into the same issue. Our page space got up to 70% - 80% and we > > saw performance "go down the toilet". Our page volumes were on MOD-9's > > but only a third of each volume was usable because the page space had > been > > defined as a MOD-3. > > We tried the DRAIN and that stopped using that page volume but didn't > clear > > it. So we shut down all of our virtual machines and re-initialized the > > page > > space on the volumes we were using and now are sitting at 19% - 20% page > > utilization. Because they were production guests, we had to wait for our > > Sunday morning window to re-init our page volumes. > > > > I was just wondering if there was another way to do what we did. We > didn't > > want to add more volumes, we just needed to fix the ones we were using. > > Thanks for all of your help and ideas. > > > > > > Gene Nelson > > Federated Insurance Company > > 121 E. Park Square > > Owatonna, MN 55060 > > (507) 455-5200 > > ext. 4555706 > > > > > > -----Original Message----- > > From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of > > Marcy Cortes > > Sent: Tuesday, June 14, 2011 9:54 AM > > To: LINUX-390@VM.MARIST.EDU > > Subject: Re: z/VM page space > > > > The question is why do you need to know? > > If you are running out of space, add more. > > If you can't, you'll have to shut virtual machines down. Start with the > > largest ones. > > BTW, don't let your paging space get more than 50% full or performance > goes > > down the toilet. > > > > > > > > Marcy > > > > -----Original Message----- > > From: Linux on 390 Port [mailto:LINUX-390@vm.marist.edu] On Behalf Of > Bill > > Holder > > Sent: Tuesday, June 14, 2011 7:44 AM > > To: LINUX-390@vm.marist.edu > > Subject: Re: [LINUX-390] z/VM page space > > > > > In z/VM is there a way to tell who or what is using that page space? > > Coming from the z/OS world > > > I know there was a way to display show was the biggest user of the page > > slots. Is there a way > > > to do that in z/VM? > > > > I am unaware of any way to tell which users (or other pageable entities) > > have their pages on a given paging volume in z/VM. > > > > Bill Holder, Senior Software Engineer > > IBM z/VM Development, Memory Management, Endicott, NY > > Phone: 607-429-3640 IBM TieLine: 620-3640 > > > > ---------------------------------------------------------------------- > > 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/ > > > > ---------------------------------------------------------------------- > > 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/ > > > > The information contained in this e-mail message is intended only for the > > personal and confidential use of the designated recipient(s) named above. > > This message may be an attorney-client or work product communication > which > > is privileged and confidential. It may also contain protected health > > information that is protected by federal law. If you have received this > > communication in error, please notify us immediately by telephone and > > destroy (shred) the original message and all attachments. Any review, > > dissemination, distribution or copying of this message by any person > other > > than the intended recipient(s) or their authorized agents is strictly > > prohibited. Thank you. > > > > ---------------------------------------------------------------------- > > 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/ > > > > ---------------------------------------------------------------------- > 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/ > -- Best regards Florian Bilek ---------------------------------------------------------------------- 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/
