> The client version is what was installed by the ceph-deploy install
> ceph-client command. Via the debian-hammer repo. Per the quickstart doc.
> Are you saying I need to install a different client version somehow?

You listed the version as 0.80.10 which is a Ceph Firefly release -- Hammer is 
0.94.x.  Was this a clean install or did you attempt to perform an upgrade?

> I'm running the rbd command from the client, can you point me to how I
> might use the bench-write command correctly? Perhaps that option doesn't
> do what I thought. Happy to be corrected, still trying to grok how
> things should go together.

You would execute bench-write just as you did.  I am just saying there is no 
reason to map the rbd image via the kernel RBD driver (i.e. no need to run 'rbd 
map' prior to executing the bench-write command).

Jason
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