Re: [Xen-devel] Limit I/O for individual disks of VM

[Tõnis Bramanis <tonis@xxxxxxxxxx>]

If i run the exact same kernel without Xen and test the i/o, it won't crash.

I just tried to look up an old post to refer it to You and seems it has 
been updated just yesterday with a fix:
http://xen.1045712.n5.nabble.com/Xen-4-1-3ware-9690SA-rejecting-I-O-to-offline-device-td3208156.html

Still, i will try to change the raid controller and see what happens then.

Regards,
Tõnis Bramanis

On 28.09.2011 10:38, Joseph Glanville wrote:
> Hi,
>
> To add to the above it looks like you have a device driver or hardware
> issue with your harddrive or raid controller.
> I/O ratelimiting might hide the symptoms but not correct the problem.
> After you have addressed that you can look at implementing rate limiting
> via the methods described below:
>
> cgroups blk-io controller:
> You can find documentation etc in the linux git repo at
> /documentation/cgroups/blkio-controller.txt
>
> dm-ioband:
> Wiki is here http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband
>
> Both of these are external to Xen for the reasons outlined by previous
> posts.
>
> Kind regards,
> Joseph.
>
> 2011/9/28 Jeremy Fitzhardinge <jeremy@xxxxxxxx <mailto:jeremy@xxxxxxxx>>
>
>     On 09/27/2011 11:25 PM, Tõnis Bramanis wrote:
>      > Hello
>      >
>      > and thank You for the answer. Has anyone of You tried to limit i/o on
>      > the VMs?
>      >
>      > I have about 40 containers and when the i/o gets too high, the host
>      > will crash with this error:
>      > [23959.739698] sd 4:0:0:0: rejecting I/O to offline device
>      > 5    [23959.771158] Buffer I/O error on device dm-0, logical
>     block 40259
>      >
>      > This is not a support request! I am just referring why i would
>     like to
>      > limit the disks i/o.
>
>     I think that IO error is a real problem that you should try to solve,
>     rather than work around it by rate-limiting IO.
>
>         J
>
>      >
>      > Regards,
>      > Tõnis Bramanis
>      >
>      > On 27.09.2011 22 <tel:27.09.2011%2022>:58, Jeremy Fitzhardinge wrote:
>      >> On 09/27/2011 01:33 AM, Tõnis Bramanis wrote:
>      >>> Hello!
>      >>>
>      >>> Will disk i/o limiting be added in any future versions? I see it in
>      >>> the 4.0 feature requests, but not in any changelogs.
>      >>
>      >> I think the hope is that we can use the generic Linux mechanisms for
>      >> this rather than having to add anything Xen-specific.
>      >>
>      >>      J
>      >
>
>
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