Hello,

I am currently doing some erasure code tests in a dev environment.

I have set the following by "default"

rule sas {
        ruleset 2
        type erasure
        min_size 3
        max_size 13
        step set_chooseleaf_tries 5
        step set_choose_tries 100
        step take fourtb
        step choose indep 0 type osd
        step emit
}

As I am splitting the file into 13 chunks it is placing these across 13 
different OSD's.

In the DEV environment I do not have 13 hosts to do full host replication, 
however I am sure I can change the crush map rule to try and split evenly 
across the 4 HOST I have.

I'm think I will need to tell it to pick 4 HOST's, and then the second line to 
pick OSD's, however as 13 does not divide by 4 exactly what would be the best 
way to lay out this crushmap rule?

Thanks,
Ashley
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