Which tool should I consider to test disk io in domU? Thanks Paras. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I was wondering the same thing. I''ve tried various ones - bonnie++, fio, etc but none of them seem to give consistent or valid results. Sometimes vms look much better then bare metal for bandwidth but then latency on the vm is terrible. Other tools show the bandwidth seems ok but latency doesn''t make sense. Can anyone recommend a tool or method to test disk io performance and compare vm to bare metal? Thanks, Tom On 2/4/10 6:00 PM, "Paras pradhan" <pradhanparas@gmail.com> wrote: Which tool should I consider to test disk io in domU? Thanks Paras. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
iozone, bonnie, bonnie++ and dd seem to give consistent result if the file size is less than 100MB but it is very inconsistent if I use file size > 1GB I don''t know if this is normal. Also wondering if there is some way to improve disk io. Right now its less than 50% than dom0. Paras. On Fri, Feb 5, 2010 at 4:04 PM, Thomas Graves <tgraves@yahoo-inc.com> wrote:> I was wondering the same thing. I’ve tried various ones – bonnie++, fio, > etc but none of them seem to give consistent or valid results. Sometimes > vms look much better then bare metal for bandwidth but then latency on the > vm is terrible. Other tools show the bandwidth seems ok but latency doesn’t > make sense. > > Can anyone recommend a tool or method to test disk io performance and > compare vm to bare metal? > > Thanks, > Tom > > > > On 2/4/10 6:00 PM, "Paras pradhan" <pradhanparas@gmail.com> wrote: > > Which tool should I consider to test disk io in domU? > > > Thanks > Paras. > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
At 16:09 -0600 5/2/10, Paras pradhan wrote:>iozone, bonnie, bonnie++ and dd seem to give consistent result if >the file size is less than 100MB but it is very inconsistent if I >use file size > 1GB > >I don''t know if this is normal.It''s likely to be the result of caching - unless the tool explicitly clears all caches, then your test files need to be bigger than your potential cache size so as to flush out old data as you go. -- Simon Hobson WANTED: "Software CD ROM Kit" for Canon CLBP 360-PS printer (Canon part no RH6-3612, or possibly RH6-3810, or RH6-3610 might do). I''ve a dead HD and need this CD so I can replace the disk and re-install the printer OS on it. If anyone knows where I might get hold of one I''d be grateful - requests to Canon drew a blank, it''s been out of support for years. Alternatively, if anyone has one of these and would let me image their hard disk ... Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users