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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-users] DomU IO issue
Could use some more detail - DomU config and a description of the storage and hardware would be good. Best Regards Nathan Eisenberg Sr. Systems Administrator Atlas Networks, LLC support@xxxxxxxxxxxxxxxx http://support.atlasnetworks.us/portal -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Stefan Below Sent: Tuesday, June 16, 2009 12:50 PM To: xen-users@xxxxxxxxxxxxxxxxxxx Subject: [Xen-users] DomU IO issue Hello, i have a a big io issue with my PV-Guest (Ubuntu 9.04). When i write or copy large files, the hdd performance is very slow. This is my iostat output. It looks like that the datat is not reading and written the same time. File copy in DomU (PV Guest, LVM) Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1718,00 2816,00 6,71 11,00 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,00 0,00 0,00 99,00 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2232,67 0,00 8,72 0,00 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,98 0,00 0,99 97,03 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1079,00 4959,00 4,21 19,37 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 1,00 0,00 0,00 99,00 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2866,00 0,00 11,20 0,00 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,99 0,00 0,99 1,98 0,00 96,04 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 2719,00 0,00 10,62 0,00 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 0,00 0,00 0,00 100,00 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 1264,00 0,00 4,94 0,00 8,00 0,00 0,00 0,00 0,00 File copy from Dom0 shows up a normal behavior: avg-cpu: %user %nice %system %iowait %steal %idle 0,99 0,00 13,86 78,22 0,00 6,93 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 13504,00 13325,00 52,75 52,05 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 10,00 81,00 0,00 9,00 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 11155,45 11163,37 43,58 43,61 8,00 0,00 0,00 0,00 0,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 15,84 76,24 0,99 6,93 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util md0 0,00 0,00 12226,00 12302,00 47,76 48,05 8,00 0,00 0,00 0,00 0,00 I am running xen 3.3.1 on Debian Lenny Dom0, Kernel 2.6.26-1-xen-amd64. Thanks a lot Stefan _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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