On 3/19/15 9:08 AM, Jared Cook wrote:
Hi, I'm starting to see a number of vendors push hyper-converged
OpenStack solutions where compute and Ceph OSD nodes are one in the
same. In addition, Ceph monitors are placed on OpenStack controller
nodes in these architectures.
Recommendations I have read in the past have been to keep these things
separate, but some vendors are now saying that this actually works out
OK in practice.
The biggest concern I have is that the compute node functions will
compete with Ceph functions, and one over utilized node will slow down
the entire Ceph cluster, which will slow down the entire cloud. Is this
an unfounded concern?
Does anyone have experience running in this mode? Experience at scale?
Not CEPH related, but it's a known tradeoff that compute resource on
control nodes can cause resource competition. This is a tradeoff for the
total cost of the cluster and the expected use case. If the use case
plans to scale out to many compute nodes, we suggest upgrading to
dedicated control nodes. This is higher cost, but somewhat necessary for
matching performance to capacity.
We may start small, but we can scale up to match the (growing) needs.
--
-jlk
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