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Re: [Xen-users] DomU IO issue
Hi,
i have the same issue with hvm guest. It looks like that the data
reading and writing is sequential. But i have no clue waht i can do.
Disk performance on the same device is under Dom0 is fine.
Stefan
Hi,
what are the mount options (/etc/fstab) on the DomU ?
In the xen-tools "partitions.d" example, "sync" is used, which give
poor performance.
this is my fstab (DomU)
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
devpts /dev/pts devpts
rw,noexec,nosuid,gid=5,mode=620 0 0
/dev/sda1 none swap sw 0 0
/dev/sda2 / ext3 noatime,nodiratime,errors=remount-ro 0 1
Stefan
Olivier
Stefan Below a écrit :
This is the domU config file:
kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
memory = '2048'
vcpus=2
disk = [
'phy:/dev/vg0/tsIbex-disk,xvda,w',
'phy:/dev/vg0/tsIbex-swap,xvdb,w',
]
extra = "(hd0)/boot/grub/menu.lst"
name = 'tsIbex'
vif = [ 'ip=192.xxx.xxx.xxx,mac=xx:xx:xx:xx:xx' ]
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
Dom0 Hardware and configuration:
Q6600 with 8GB RAM
sw Raid10,f2 Layout with 4 disks (i know, hardware raid is
better.....) (storage for DomU via LVM)
sw Raid1 with 4 disks for Dom0 root partition
Debian Lenny, xen 3.3.1, with Kernel 2.6.26-1-xen-amd64.
Anything else i should provide?
Thanks,
Stefan
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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