That's good to know, thanks for the explanation.
Fortunately we are in the process of cluster redesign and we can definitely fix that scenario.
Regards,
Webert Lima
DevOps Engineer at MAV Tecnologia
Belo Horizonte - Brasil
IRC NICK - WebertRLZ
On Tue, Aug 7, 2018 at 4:37 PM John Spray <jspray@xxxxxxxxxx> wrote:
On Tue, Aug 7, 2018 at 5:42 PM Reed Dier <reed.dier@xxxxxxxxxxx> wrote:
>
> This is the first I am hearing about this as well.
This is not a Ceph-specific thing -- it can also affect similar
systems like Lustre.
The classic case is when under some memory pressure, the kernel tries
to free memory by flushing the client's page cache, but doing the
flush means allocating more memory on the server, making the memory
pressure worse, until the whole thing just seizes up.
John
> Granted, I am using ceph-fuse rather than the kernel client at this point, but that isn’t etched in stone.
>
> Curious if there is more to share.
>
> Reed
>
> On Aug 7, 2018, at 9:47 AM, Webert de Souza Lima <webert.boss@xxxxxxxxx> wrote:
>
>
> Yan, Zheng <ukernel@xxxxxxxxx> 于2018年8月7日周二 下午7:51写道：
>>
>> On Tue, Aug 7, 2018 at 7:15 PM Zhenshi Zhou <deaderzzs@xxxxxxxxx> wrote:
>> this can cause memory deadlock. you should avoid doing this
>>
>> > Yan, Zheng <ukernel@xxxxxxxxx>于2018年8月7日 周二19:12写道：
>> >>
>> >> did you mount cephfs on the same machines that run ceph-osd?
>> >>
>
>
> I didn't know about this. I run this setup in production. :P
>
> Regards,
>
> Webert Lima
> DevOps Engineer at MAV Tecnologia
> Belo Horizonte - Brasil
> IRC NICK - WebertRLZ
>
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