Re: Ceph FS - MDS problem

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 07/03/2015 10:25 AM, Mathias Buresch wrote:
> Hi there,
> 
> maybe you could be so kind and help me with following issue:
> 
> We running Ceph FS but there's repeatedly a problem with the MDS.
> 

What version of Ceph are you running?

> Sometimes following error occurs: "mds0: Client 701782 failing to
> respond to capability release"
> Listing the session informations shows that the "num_caps" on that
> Client is much more than on the other Clients. ( see also -> attachement )
> 
> The problem is that the load on one of the server is increasing to
> really high value ( 80 to 100 ) independent of client which is complaining.
> 
> I guess my problem is also that I dont really understand the meaning of
> those "capabilties".
> 
> Following facts (let me know if you need more):
> 
>  * CEPH-FS-Client, MDS, MON, OSD all on same server
>  * Kernel-Client (Kernel: 3.14.16-031416-generic)

Kernel 3.14 is rather old when it comes to CephFS. I would recommend at
least 3.19 due to various fixes.

Could you give that a try?

Wido

>  * MDS config
>      o only raised "mds cache size = 5000000"  (because before there
>        was error "failing to respond to cache pressure")
> 
> 
> Best regards
> Mathias
> 
> 
> 
>     
> 
> 
> 
> 
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> 


-- 
Wido den Hollander
42on B.V.
Ceph trainer and consultant

Phone: +31 (0)20 700 9902
Skype: contact42on
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com



[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux