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.li...@computational.bio.uni-giessen.de>
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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