Hi Elias,
When we have received the same warning, our solution has been to increase
the inode cache on the MDS.
We have added
mds cache size = 2000000
to the [global] section of ceph.conf on the MDS server. We have to restart
MDS for the changes to be applied.
Sean
On 9 June 2016 at 19:55, Elias Abacioglu <elias.abacio...@deltaprojects.com>
wrote:
> Hi,
>
> I know this have been asked here a couple of times, but couldn't find
> anything concrete.
>
> I have the following warning in our ceph cluster.
> mds0: Client web01:cephfs.web01 failing to respond to cache pressure
>
> In previous Ceph versions this might have been a bug. But now we are
> running Jewel.
> So is there a way to fix this warning?
> Do I need to tune some values? Boost the cluster? Boost the client?
>
> Here are some details:
> Client kernel is 4.4.0.
> Ceph 10.2.1
>
> # ceph mds dump
> dumped fsmap epoch 5755
> fs_name cephfs
> epoch 5755
> flags 0
> created 2015-12-03 11:21:28.128193
> modified 2016-05-16 06:48:47.969430
> tableserver 0
> root 0
> session_timeout 60
> session_autoclose 300
> max_file_size 1099511627776
> last_failure 4900
> last_failure_osd_epoch 5884
> compat compat={},rocompat={},incompat={1=base v0.20,2=client writeable
> ranges,3=default file layouts on dirs,4=dir inode in separate object,5=mds
> uses versioned encoding,6=dirfrag is stored in omap,8=no anchor table}
> max_mds 1
> in 0
> up {0=574261}
> failed
> damaged
> stopped
> data_pools 2
> metadata_pool 3
> inline_data disabled
> 574261: 10.3.215.5:6801/62035 'ceph-mds03' mds.0.5609 up:active seq
> 515014
> 594257: 10.3.215.10:6800/1386 'ceph-mds04' mds.0.0 up:standby-replay
> seq 1
>
> Thanks,
> Elias
>
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>
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