Hello, We are looking for recommendations and guidelines for using erasure codes (EC) with Ceph. Our setup consists of 25 identical nodes which we dedicate to Ceph. Each node contains 10 HDDs (full specs below) We started with 10 nodes (comprising 100 OSDs) and created a pool with 3-times replication. In order to increase the usable capacity, we would like to go for EC instead of replication. - Can anybody share with us recommendations regarding the choice of plugins and rulesets? - In particular, how do we relate to the number of nodes and OSDs? Any formulas or rules of thumb? - Is it possible to change rulesets live on a pool? We currently use Infernalis but plan to move to Jewel. - Are there any improvement in Jewel with regard to erasure codes? Looking forward for your answers. ===== Full specs of nodes CPU: 2 x Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz Memory: 128GB of Memory OS Storage: 2 x SSD 240GB Intel S3500 DC (raid 1) Journal Storage: 2 x SSD 400GB Intel S3300 DC (no Raid) OSD Disk: 10 x HGST ultrastar-7k6000 6TB Network: 1 x 10Gb/s OS: Ubuntu 14.04 -- Yoann Moulin EPFL IC-IT _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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