On Wed, Nov 02, 2011 at 07:37:17AM -0400, Bauer, Bobby (NIH/CIT) [E] wrote: > Date: Wed, 2 Nov 2011 07:37:17 -0400 > From: "Bauer, Bobby (NIH/CIT) [E]" <[email protected]> > To: [email protected] > Subject: Odd swap space behavior > > One of our Redhat servers got a LOT of activity yesterday and the swap space > looks funny to me. > > swapon -s > Filename Type Size Used > Priority > /dev/dasda2 partition 1023976 3692 -1 > /dev/dasdb1 partition 194964 420 2 > /dev/dasdc1 partition 64976 152 1 > /dev/dasdd1 partition 196596 25244 3 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
<quote from http://www.vm.ibm.com/perf/tips/linuxper.html> Swap extents of equal priority are used in round-robin fashion. Equal prioritization can be used to spread swap I/O across chpids and controllers, but if you are doing this, be careful not to put all the swap extents on minidisks on the same physical DASD volume, for if you do, you will not be accomplishing any spreading. </quote> I'd be interested to see what today's thinking is. //rhi - now back to lurking -- ... Point and click ... ... probably means that you forgot to load the gun ... Have a nice day ;-) Richard Higson mailto:[email protected] ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
