Hi, I have some osd's on hdd's and some on ssd's, just like the example in these docs: http://ceph.com/docs/firefly/rados/operations/crush-map/ Now I'd like to place an erasure encoded pool on the hdd's and a replicated (cache) pool on the ssd's. In order to do that, I have to split the crush maps into two roots, according to the docs. The way the docs describe it, I have to create two roots, and then separate "server"-nodes for ssd's and hdd's, then the osd's under the right server node. My hdd's and ssd's are mixed within hosts though: I have four physical hosts each with a couple of hdd's and an ssd. So there is not a hdd-server and a ssd-server, like in the docs. Or do I have to create two server-nodes per host? It appears to me that not all rules will still work the same way in that case. Regards, Erik.
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