Re: [Xen-users] DomU IO issue

["Olivier B." <xen.list@xxxxxxxxx>]

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.
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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> >
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