i have hp 380 6 with hp 410i 512 mb cache battery backup. It seems that vm machines are very slow. hdparm -Tt shows speed of drive at 107 mb/s without cache and very cached speeds. Server has 24 gb of ram yet vm seam very slow. Any way to optimize ? I use laptop hard drives insead of sas as raw read speed is 127 mb/s for sas and 107 mb/s for laptop drive. _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On 16/07/13 16:47, jacek burghardt wrote:> i have hp 380 6 with hp 410i 512 mb cache battery backup. It seems that > vm machines are very slow. hdparm -Tt shows speed of drive at 107 mb/s > without cache and very cached speeds. Server has 24 gb of ram yet vm > seam very slow. Any way to optimize ? I use laptop hard drives insead of > sas as raw read speed is 127 mb/s for sas and 107 mb/s for laptop drive.Hello, From your subject I assume that you are attaching lvm logical volumes to guests. Could you provide the version of Xen you are using and the kernel you are running in both Dom0 and DomU? Also the boot log and the config file of the DomU might be helpful. "very slow" is not really an accurate way to describe performance, could you run some disk benchmarks attaching the volume to Dom0 and DomU to actually see the speed difference. I would recommend using fio for that. Roger.
I am using 4.3 but it turns out that hard drive was acting strange so I replaced it and now everything is working fine . On Wed, Jul 17, 2013 at 2:46 AM, Roger Pau Monné <roger.pau@citrix.com>wrote:> On 16/07/13 16:47, jacek burghardt wrote: > > i have hp 380 6 with hp 410i 512 mb cache battery backup. It seems that > > vm machines are very slow. hdparm -Tt shows speed of drive at 107 mb/s > > without cache and very cached speeds. Server has 24 gb of ram yet vm > > seam very slow. Any way to optimize ? I use laptop hard drives insead of > > sas as raw read speed is 127 mb/s for sas and 107 mb/s for laptop drive. > > Hello, > > From your subject I assume that you are attaching lvm logical volumes to > guests. Could you provide the version of Xen you are using and the > kernel you are running in both Dom0 and DomU? Also the boot log and the > config file of the DomU might be helpful. > > "very slow" is not really an accurate way to describe performance, could > you run some disk benchmarks attaching the volume to Dom0 and DomU to > actually see the speed difference. I would recommend using fio for that. > > Roger. >_______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users