On Thu, Dec 18, 2014 at 5:16 AM, Patrick McGarry <patrick@xxxxxxxxxxx> wrote:
> 2. What should be the minimum hardware requirement of the server (CPU,
> Memory, NIC etc)
There is no real "minimum" to run Ceph, it's all about what your
workload will look like and what kind of performance you need. We have
seen Ceph run on Raspberry Pis.
Technically, the smallest cluster is a single node with a 10 GiB disk. Anything smaller won't work.
That said, Ceph was envisioned to run on large clusters. IIRC, the reference architecture has 7 rows, each row having 10 racks, all full.
Those of us running small clusters (less than 10 nodes) are noticing that it doesn't work quite as well. We have to significantly scale back the amount of backfilling and recovery that is allowed. I try to keep all backfill/recovery operations touching less than 20% of my OSDs. In the reference architecture, it could lose a whole row, and still keep under that limit. My 5 nodes cluster is noticeably better better than the 3 node cluster. It's faster, has lower latency, and latency doesn't increase as much during recovery operations.
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