primary pg and replica pg are placed on the same node under "ssd-primary" rule

["ymorita000@xxxxxxxxx" <ymorita000@xxxxxxxxx>]

Hi,

I am trying to test a storage tiering using the following
"ssd-primary" rule set introduced in the Ceph page. However, there
seems to be a chance that primary pg and replica pg are placed on the
same node.

Is there any way to avoid this at this point in time?

      rule ssd-primary {
              ruleset 4
              type replicated
              min_size 0
              max_size 10
              step take ssd
              step chooseleaf 1 type host
              step emit
              step take platter
              step chooseleaf -1 type host
              step emit
      }

Ceph - CRUSH Maps
http://ceph.com/docs/master/rados/operations/crush-map/#placing-different-pools-on-different-osds

Thank you.
Yuji
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