Re: Mapping RBD On Ceph Cluster Node

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

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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