[ceph-users] EC pool creation results in incorrect M value?

[Smith, Eric]

I have a Ceph Luminous (12.2.12) cluster with 6 nodes. I'm attempting to create 
an EC3+2 pool with the following commands:

  1.  Create the EC profile:
     *   ceph osd erasure-code-profile set es32 k=3 m=2 plugin=jerasure w=8 
technique=reed_sol_van crush-failure-domain=host crush-root=sgshared
  2.  Verify profile creation:
[root@mon-1 ~]# ceph osd erasure-code-profile get es32
crush-device-class=
crush-failure-domain=host
crush-root=sgshared
jerasure-per-chunk-alignment=false
k=3
m=2
plugin=jerasure
technique=reed_sol_van
w=8

  1.  Create a pool using this profile:
     *   ceph osd pool create ec32pool 1024 1024 erasure es32
  2.  List pool detail:
     *   pool 31 'es32' erasure size 5 min_size 4 crush_rule 11 object_hash 
rjenkins pg_num 1024 pgp_num 1024 last_change 1568 flags hashpspool 
stripe_width 12288 application ES
  3.  Here's the crush rule that's created:
    {
        "rule_id": 11,
        "rule_name": "es32",
        "ruleset": 11,
        "type": 3,
        "min_size": 3,
        "max_size": 5,
        "steps": [
            {
                "op": "set_chooseleaf_tries",
                "num": 5
            },
            {
                "op": "set_choose_tries",
                "num": 100
            },
            {
                "op": "take",
                "item": -2,
                "item_name": "sgshared"
            },
            {
                "op": "chooseleaf_indep",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    },

>From the output of "ceph osd pool ls detail" you can see min_size=4, the crush 
>rule says min_size=3 however the pool does NOT survive 2 hosts failing.

Am I missing something?


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