xiaoxi chen <superdebugger@...> writes: > > Hmm, I asked in the ML some days before,:) likely you hit the kernel bug which fixed by commit 5e804ac482 "ceph: don't invalidate page cache when inode is no longer used”. This fix is in 4.4 but not in 4.2. I haven't got a chance to play with 4.4 , it would be great if you can have a try. > For MDS OOM issue, we did a MDS RSS vs #Inodes scaling test, the result showing around 4MB per 1000 Inodes, so your MDS likely can hold up to 2~3 Million inodes. But yes, even with the fix if the client misbehavior (open and hold a lot of inodes, doesn't respond to cache pressure message), MDS can go over the throttling and then killed by OOM > Hello! I will install a newer kernel version and I will increase the ram a bit just to see how it handles it. Thanks! > > To: ceph-users <at> lists.ceph.com> From: castrofjoao- Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx> Date: Tue, 28 Jun 2016 21:34:03 +0000> Subject: Re: CephFS mds cache pressure> > Hey John,> > ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)> 4.2.0-36- generic> > Thanks!> > _______________________________________________> ceph- users mailing list> ceph-users-idqoXFIVOFJgJs9I8MT0rw@xxxxxxxxxxxxxxxx> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > _______________________________________________ > ceph-users mailing list > ceph-users@... > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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