Hi,all
I found content below at
http://ceph.com/docs/master/rados/operations/crush-map :
step choose firstn {num} type {bucket-type}
Description: Selects the number of buckets of the given type. The
number is usually the number of replicas in the pool (i.e., pool size).
If {num} == 0, choose pool-num-replicas buckets (all available).
If {num} > 0 && < pool-num-replicas, choose that many buckets.
If {num} < 0, it means pool-num-replicas - {num}.
However, corresponding source code is that (V0.87, mapper.c ,
crush_do_rule(...)) :
if (numrep <= 0) {
numrep += result_max;
if (numrep <= 0)
continue;
}
I think the correct description is 'If {num} < 0, it means pool-num-replicas
+ {num}'.
--------------
TongLei | XOR Media
Storage Application Department of XOR Media China
Tel. 86-21-61213323 Fax. 86-21-52065237
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