> 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
Gene, so are you saying you reformatted "live" paging volumes while they were still attached to the system? That is not really very safe, even if all of the guests have been logged off - CP itself has some pageable structures that could well be lost, potentially causing a latent abend that would occur at some later time. I suppose if you verified that usage of the volumes in question had really gone completely to zero before re-initializing, that might be "safe enough", but it still seems rather dicey - we make no promises about when or why CP might choose to page something out (yes, the overwhelming majority of cases are when storage is full and the system starts paging, which isn't going to happen with all of the guests logged off, but there are a few other oddball cases that could happen when the system is not otherwise paging). - Bill 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/
