We have tested it for a while, basically it seems kind of stable but show terrible bad performance.
This is not the fault of Ceph , but levelDB, or more generally, all K-V storage with LSM design(RocksDB,etc), the LSM tree structure naturally introduce very large write amplification---- 10X to 20X when you have tens GB of data per OSD. So you can always see very bad sequential write performance (~200MB/s for a 12SSD setup), we can share more details on the performance meeting. To this end, key-value backend with LevelDB is not useable for RBD usage, but maybe workable(not tested) in the LOSF cases ( tons of small objects stored via rados , k-v backend can prevent the FS metadata become the bottleneck) From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Haomai Wang Sent: Monday, December 1, 2014 9:48 PM To: Satoru Funai Cc: ceph-us...@ceph.com Subject: Re: [ceph-users] LevelDB support status is still experimental on Giant? Yeah, mainly used by test env. On Mon, Dec 1, 2014 at 6:29 PM, Satoru Funai <satoru.fu...@gmail.com<mailto:satoru.fu...@gmail.com>> wrote: Hi guys, I'm interested in to use key/value store as a backend of Ceph OSD. When firefly release, LevelDB support is mentioned as experimental, is it same status on Giant release? Regards, Satoru Funai _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Best Regards, Wheat
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