did you mount cephfs on the same machines that run ceph-osd?
On Tue, Aug 7, 2018 at 5:14 PM Zhenshi Zhou <deaderzzs@xxxxxxxxx> wrote:
>
> Hi Burkhard,
> Files located in /sys/kernel/debug/ceph/<some id> are all new files generated after I reboot the server.
> The clients were in blacklist and I manully remove them from the blacklist. But the clients hung still.
>
> Thanks
>
> Burkhard Linke <Burkhard.Linke@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> 于2018年8月7日周二 下午4:54写道：
>>
>> Hi,
>>
>>
>> you are using the kernel implementation of CephFS. In this case some
>> information can be retrieved from the /sys/kernel/debug/ceph/<some id>
>> directory. Especially the mdsc, monc and osdc files are important, since
>> they contain pending operations on mds, mon and osds.
>>
>>
>> We have a similar problem in our setup. If a MDS failover happens, some
>> clients (like 1 in 100 clients) do not react to the MDS map change and
>> keep on trying to contact the old MDS. In this case the msdc file in the
>> above mentioned directory lists from outstanding requests to the old MDS.
>>
>>
>> I would propose to start by having a look at these files and also at the
>> ceph client blacklist ('ceph osd blacklist ls').
>>
>>
>> Regards,
>>
>> Burkhard
>>
>>
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>
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