Re: ceph rbd crashes/stalls while random write 4k blocks

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On Fri, May 25, 2012 at 8:47 AM, Stefan Priebe - Profihost AG
<s.priebe@xxxxxxxxxxxx> wrote:
> Am 24.05.2012 16:19, schrieb Florian Haas:
>> On Thu, May 24, 2012 at 4:09 PM, Stefan Priebe - Profihost AG
>> <s.priebe@xxxxxxxxxxxx> wrote:
>>>> Take a look at these to see if anything looks familiar:
>>>>
>>>> http://oss.sgi.com/bugzilla/show_bug.cgi?id=922
>>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/979498
>>>> http://oss.sgi.com/archives/xfs/2011-11/msg00400.html
>>>
>>> These are solved by using 3.0.20.
>>
>> ... or so Christoph says, but comment #4 in bug 922 seems to indicate otherwise.
>
> I'm sorry you're absolutely right. BUT XFS had some regressions with
> xlog_grabt_log_space since 2.6.28 which was fixed in 3.0.X by reverting
> back to a kernel thread instead of workers. I was working with Christoph
> and Dave on this problem and it tooked be nearly a whole month to track
> that down (git commit c7eead1e118fb7e34ee8f5063c3c090c054c3820). In this
> case (#922) it seems it is really related to a too small log. But I
> don't have a too small log in my ceph case ;-)

Hmmm. So what's Chinner saying about this one? Should we move this
discussion to an XFS list?

Cheers,
Florian

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