Hello, Ceph is not problem. Problem is that btrfs is not still production. There are many testing line in source codes.
But it's really up to you which filesystem you use. Each filesystem has unique functions so you have to consider them to get best performance from one of them. Meaning that there would be no perfect filesystem. Shinobu On Sat, Aug 8, 2015 at 6:29 AM, Lionel Bouton <[email protected]> wrote: > Le 07/08/2015 22:05, Ben Hines a écrit : > > Howdy, > > > > The Ceph docs still say btrfs is 'experimental' in one section, but > > say it's the long term ideal for ceph in the later section. Is this > > still accurate with Hammer? Is it mature enough on centos 7.1 for > > production use? > > > > (kernel is 3.10.0-229.7.2.el7.x86_64 ) > > Difficult to say with distribution kernels, they may have patched their > kernels to fix some Btrfs issues or not (3.10.0 is more than 2 years > old) I wouldn't trust them myself. > > We are converting our OSDs to Btrfs but we use recent kernel versions > (4.0.5 currently), we disabled Btrfs snapshots in ceph.conf (they are > too costly), created journals NOCOW (we will move them to SSDs > eventually) and developed our own defragmentation scheduler (Btrfs' own > autodefrag didn't perform well with Ceph when we started and we use the > btrfs defragmentation process to recompress data with zlib instead of > lzo as we mount OSD fs with compress=lzo for lower latency OSD writes). > In the above conditions, it is faster than XFS (~30% lower apply > latencies according to ceph osd perf), detects otherwise silent data > corruption (it caught some already) and provides ~10% additional storage > space thanks to lzo/zlib compression (most of our data is in the form of > already compressed files stored on RBD, actual gains obviously depend on > the data). > > Best regards, > > Lionel > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Email: [email protected] [email protected] Life w/ Linux <http://i-shinobu.hatenablog.com/>
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