Ceph

Assuming that ceph-node1 is in default root, when we define and assign following crush rule:

rule primary_as_host_2 {
        ruleset 2
        type replicated
        min_size 1
        max_size 10
        step take ceph-node1
        step choose firstn 1 type osd
        step emit
        step take default
        step chooseleaf firstn -1 type host
        step emit
}

pool can get duplicated osd in the acting set (osd on ceph-node1 is returned by both of the choose statement ) . I'll be nice to have an option to force uniqueness globally.