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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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