On Wed, 9 Jul 2008, Erwin, Brock A wrote:
> I'm not sure I understand the difference between the monitor and the
> mds.  Can you clarify?

The monitor(s) manage cluster state information for the MDS cluster, OSD 
cluster, and clients.  They are the one component that runs at a 
fixed/known IP address... all other daemons are discovered by getting the 
appropriate map (osdmap, mdsmap) from the monitor(s).  cmon needs a small 
amount of local storage to store cluster state.

The MDSs manage the file system namespace.

Most likely you'll end up running the monitors and MDSs on the same 
hosts...

sage

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