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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-bounces@xxxxxxxxxxxxxx]
On Behalf Of Haomai Wang Yeah, mainly used by test env. On Mon, Dec 1, 2014 at 6:29 PM, Satoru Funai <satoru.funai@xxxxxxxxx> wrote:
-- Best Regards, Wheat |
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