Le 10/03/2016 09:26, Nick Fisk a écrit : > What is your intended use case RBD/FS/RGW? There are no major improvements > in Jewel that I am aware of. The big one will be when EC pools allow direct > partial overwrites without the use of a cache tier. The main goal is for RadosGW. Most of the access will be read only. We are interested also to use block device and later cephfs but it's not in our priority. And in those cases, we did not discuss about replicate or erasure yet. If you have some insight about this cases, we are also interested. Thnaks, Yoann >> -----Original Message----- >> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of >> Yoann Moulin >> Sent: 09 March 2016 16:01 >> To: ceph-users@xxxxxxxx >> Subject: how to choose EC plugins and rulesets >> >> 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 > -- 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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