Hi, I'd like to run Ceph on a few machines, each of which has multiple disks. The disks are heterogeneous: some are rotational disks of larger capacities while others are smaller solid state disks. What are the recommended ways of running ceph osd-es on them?
Two of the approaches can be: 1) Deploy an osd instance on each hard disk. For instance, if a machine has six hard disks, there will be six osd instances running on it. In this case, does Ceph's replication algorithm recognize that these osd-es are on the same machine therefore try to avoid placing replicas on disks/osd-es of a same machine? 2) Create a logical volume spanning multiple hard disks of a machine and run a single copy of osd per machine. If you have previous experiences, benchmarking results, or know a pointer to the corresponding documentation, please share with me and other users. Thanks a lot. Cheers, Fangzhe
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