On Wed, May 22, 2019 at 3:03 PM Rainer Krienke <krienke@xxxxxxxxxxxxxx> 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?
Is this what you're looking for?
# ceph osd pool ls detail -f json | jq .[0].erasure_code_profile
"jera_4plus2"
-- Dan
>
> 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
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