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
> To: [email protected] > From: [email protected] > Date: Tue, 28 Jun 2016 21:34:03 +0000 > Subject: Re: [ceph-users] CephFS mds cache pressure > > Hey John, > > ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374) > 4.2.0-36-generic > > Thanks! > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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