Re: fio rbd hang for block sizes > 1M

[Mark Kirkwood <mark.kirkwood-6STWZtX7tXAqAMOr+u8IRA@public.gmane.org>]

Interestingly, I first encountered this on (what I think is) 0.86 
release (0.86-1precise). I wonder if you had a bigger rbd cache on the 
release cluster you tested?

As mentioned in the same named thread on -users, disabling the rbd cache 
stops the hang.

Regards

Mark

On 25/10/14 03:09, Mark Nelson wrote:
> More info:
>
> I went back and tested fio versions back to 2.1.10 and still encountered
> the issue.  I then went back and tested the v0.86 release versus giant
> and was able to get through a 4MB read test without error.  I suspect
> this is not an fio problem.  I'll try to narrow down the commit after
> 0.86 that is causing this.
>
> Mark
>
> On 10/24/2014 08:19 AM, Mark Nelson wrote:
>> FWIW we are seeing this at Redhat/Inktank with recent fio from master
>> and ceph giant branch as well.
>>
>> Mark
>>
>> On 10/24/2014 01:17 AM, Mark Kirkwood wrote:
>>> On 24/10/14 18:35, Jens Axboe wrote:
>>>> CC'ing relevant parties, leaving email intact.
>>>>
>>>
>>> Note that the 'Killed' is because I killed the run - it hangs and
>>> appears to be non interruptable. I missed that when pasting, sorry!
>>>
>>>>> $ fio read-test.fio     # attached
>>>>> rbd_thread: (g=0): rw=read, bs=2M-2M/2M-2M/2M-2M, ioengine=rbd,
>>>>> iodepth=32
>>>>> fio-2.1.13-88-gb2ee7
>>>>> Starting 1 process
>>>>> rbd engine: RBD version: 0.1.8
>>>>> Killed1 (f=1): [R(1)] [inf% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta
>>>>> 1158050441d:06h:59m:33s]
>>>
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>