Open Stack

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?


Thanks,

Jared Cook
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