Hi, do you happen to have a relatively large number of clients and a relatively small cache size on the MDS?
Paul 2018-07-23 13:16 GMT+02:00 Daniel Carrasco <d.carra...@i2tic.com>: > Hello, > > I've created a Ceph cluster of 3 nodes (3 mons, 3 osd, 3 mgr and 3 mds > with two active). This cluster is for mainly for server a webpage (small > files) and is configured to have three copies of files (a copy on every > OSD). > My question is about ceph.fuse clients: I've noticed an insane CPU usage > when the fuse client is used, while the kernel client usage is unnoticeable. > > For example, now i've that machines working with kernel client and the CPU > usage is less than 30% (all used by php processes). When I change to > ceph.fuse the CPU usage raise to more than 130% and even sometimes up to > 190-200% (on a two cores machines means burn the CPU). > > Now I've seen two warnings on the cluster: > 1 MDSs report oversized cache > 4 clients failing to respond to cache pressure > > and I think that maybe is a lack of capabilities on ceph kernel modules, > so I want to give a try to fuse module but I've the above problem. > > My SO is Ubuntu 16.04 x64 with kernel version 4.13.0-45-generic and ceph > server/client version is 12.2.7. > > How I can debug why that CPU usage?. > > Thanks! > -- > _________________________________________ > > Daniel Carrasco Marín > Ingeniería para la Innovación i2TIC, S.L. > Tlf: +34 911 12 32 84 Ext: 223 > www.i2tic.com > _________________________________________ > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90
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