Re: Mapping RBD On Ceph Cluster Node

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On Friday, April 29, 2016, Edward Huyer <erhvks@xxxxxxx> wrote:
This is more of a "why" than a "can I/should I" question.

The Ceph block device quickstart says (if I interpret it correctly) not to use a physical machine as both a Ceph RBD client and a node for hosting OSDs or other Ceph services.

Is this interpretation correct? If so, what is the reasoning? If not, what is it actually saying?

It's important not to use the kernel rbd mount on a machine hosting OSDs because if it runs like on memory and tries to flush out shift pages, but the OSD needs to allocate memory to handle the write... You have a problem!

Hosting all userspace processes shouldn't be a problem, though, apart from the usual resource contention problems of running hyper-converged.
-Greg
 

Thanks in advance.
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