On Wed, Nov 2, 2011 at 2:25 PM, Richard Higson <richard.hig...@gt.owl.de> wrote:
> haven't done Linux on Z for a while, but I have always used the same > "Priority" for the swapdisks > so that linux could spread out the IO to several disks (preferably on > separate spindles). > This works well on x86 (real & VMware) and P-Series The OP is correct in using different priority for the swap devices. The issue with Linux on z/VM using VDISK as swap is not to spread the I/O (there is no I/O for VDISK). Multiple swap devices with different priority is to force Linux to reuse blocks rather than take fresh ones. This reduces the amount of pages that must be backed by z/VM. It's also important when you have a mix of disk types (like VDISK and real disk). Rob ---------------------------------------------------------------------- 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/
