That's not quite how Ceph works. I recommend perusing some of the
introductory documentation at ceph.com/docs, but in short:
When you set up a ceph pool, you are specifying groups of hard drives which
will be used together.
When you create an RBD volume in a pool, you are saying "I want this volume
to store its data within that pool of storage".
When you write to your RBD volume, the data is split into chunks (4MB by
default) and each chunk is independently placed on OSDs in the appropriate
pool.
So when you have a large RBD volume, you can expect part of its data to be
stored on every OSD in the pool.
-Greg

On Tuesday, April 29, 2014, <yalla.gnan.ku...@accenture.com> wrote:

>  Hi All,
>
>
>
> I have created a ceph volume in a pool which I have defined. A hard drive
> is also attached to
>
> the ceph node.  How do we know on which hard drive   ceph created this
> volume on ?
>
> What is its path ?
>
>
>
>
>
> Thanks
>
> Kumar
>
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-- 
Software Engineer #42 @ http://inktank.com | http://ceph.com
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