[crush] Selecting the current rack

[Emmanuel Lacour <elacour@xxxxxxxxxxxxxxx>]

Dear ceph users,


I try to write a crush ruleset that will, for a pool size of 3, put a
copy in another host in the local rack and a copy in another rack. I now
how to do the later, but I do not understand how to match the current
rack. Here is my try:


rule replicate_three_times {
    ruleset 1
    type replicated
    min_size 3
    max_size 3
    step take default
    step chooseleaf firstn 1 type rack
    step emit
    step take rack
    step chooseleaf firstn 1 type host
    step emit
}


I thought that "take rack" will select the rack the primary host is in,
but it does not compile and claims that it's undefined.


Any help would be welcome :)
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