On Thu, May 05, 2011 at 11:02:17PM -0700, Brian Chrisman wrote:
> Sage can verify but as I understand it, all rados clients need is the
> osd map from the mon server.
> In other systems, that might be considered 'metadata', but in ceph,
> the 'metadata' server (MDS) tracks filesystem metadata.
Let me just confirm that. It goes something like this:
mon manages things related to cluster membership, health and internal
coordination.
osds store objects, in a flat hierarchy, only providing simple
operations (not a real filesystem). This service is also called RADOS.
mds builds a POSIX filesystem from the object storage. MDS is the only
component that really knows about filenames in the Ceph FS, chmod,
etc.
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