>Hi > >I have one question about running linux on z/VM and z/VM memory >management. > >My current environment (production) > >Total real memory = 12GB >Total page volumes = +- 5GB >Total memory allocation to linux servers (guests) = 7104MB (+- 7GB) >Paging usage = 40 - 50% (2GB - 2.5GB) >XSTORE = 2GB (just recently added after noticing paging did happen in z/VM though we have enough real memory) > >Main storage used by z/VM is only 5GB (meaning at any one time, 2 GB or more will be swapped off) > >Operating Systems: >z/VM 4.4 >SLES 8.1 SP4 (31-bit) > >I observed that by default, memory mode for linux guest is V=V. Hence, >z/VM takes control of memory management. Since I have enough real >memory, why z/VM >still does the paging? Any way to avoid paging on z/VM. I would prefer >to let linux server to have real memory (V=R). Any comments on this? And >how to set it in the user direct? Any fine-tuning can be done?
You observe the z/VM 2GB mitigation. An excellent source of information is the z/VM performance website: http://www.vm.ibm.com/perf/tips/2gstorag.html > >I also heard that V=R will not be supported in z/VM 5.1. Is it true? Yes the V=R support is dropped in z/VM 5.1. More details are to be find here: http://www.vm.ibm.com/perf/tips/z890.html > >Thanks for your attention. > >Regards, >Johnny Tan Regards / Mit freundlichen Gruessen Mario Held Linux - architecture and performance IBM Germany Lab, Schoenaicher Str. 220, 71032 Boeblingen ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
