CRUSH only specifies where the chunks are placed, not how many chunks there are (the pool specifies this) This is the same with replicated rules: pool specifies the number of replicas, the rule where they are put.
You can use one CRUSH rule for multiple ec pools Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Wed, May 22, 2019 at 3:03 PM Rainer Krienke <krie...@uni-koblenz.de> wrote: > Hello, > > I created an erasure code profile named ecprofile-42 with the following > parameters: > > $ ceph osd erasure-code-profile set ecprofile-42 plugin=jerasure k=4 m=2 > > Next I created a new pool using the ec profile from above: > > $ ceph osd pool create my_erasure_pool 64 64 erasure ecprofile-42 > > The pool created then has an autogenerated crush rule with the contents > as shown at the end of this mail (see: ceph osd crush rule dump > my_erasure_pool). > > What I am missing in the output of the crush rule dump below are the k,m > values used for this pool or a "link" from the crushrule to the erasure > code profile that contains these settings and was used creating the pool > and thus the ec crushrule. If I had several ec profiles and pools > created with the different ec profiles how else could I see which k,m > values were used for the different pools? > > For a replicated crush rule there is the size parameter which is part of > the crush-rule and indirectly tells you the number of replicas, but what > about erasure coded pools? > > Probably there is somewhere the link I am looking for, but I din't find > it yet... > > Thanks Rainer > > # > # autogenerated crush rule my_erasure_pool: > # > $ ceph osd crush rule dump my_erasure_pool > { > "rule_id": 1, > "rule_name": "my_erasure_pool", > "ruleset": 1, > "type": 3, > "min_size": 3, > "max_size": 6, > "steps": [ > { > "op": "set_chooseleaf_tries", > "num": 5 > }, > { > "op": "set_choose_tries", > "num": 100 > }, > { > "op": "take", > "item": -1, > "item_name": "default" > }, > { > "op": "chooseleaf_indep", > "num": 0, > "type": "host" > }, > { > "op": "emit" > } > ] > } > > -- > Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1 > 56070 Koblenz, Tel: +49261287 1312 Fax +49261287 100 1312 > Web: http://userpages.uni-koblenz.de/~krienke > PGP: http://userpages.uni-koblenz.de/~krienke/mypgp.html > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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