Ceph

ceph version 12.1.0

ceph osd crush class ls
[
"ssd",
"hdd"
]

rule default {
ruleset 0
type replicated
min_size 2
max_size 10
step take default class hdd
step chooseleaf firstn 0 type host
step emit
}

rule ssd {
ruleset 1
type replicated
min_size 2
max_size 10
step take default class ssd
step chooseleaf firstn 0 type host
step emit
}

ceph osd dump | grep data
pool 8 'data' replicated size 3 min_size 2 crush_rule 0

ceph osd pool set data crush_ruleset 1
Invalid command: crush_ruleset not in....
Error EINVAL: invalid command