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
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