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

[Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>]

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>

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 22:58, 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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