Re: examining the layout of an existing raid device?

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On Mon, Sep 26, 2011 at 08:32:48PM +1000, NeilBrown wrote:
> On Mon, 26 Sep 2011 06:18:24 -0400 Christoph Hellwig <hch@xxxxxxxxxxxxx>
> wrote:
> 
> > Maybe I'm just stupid, but is there a way to figure out the exact
> > geometry (e.g. pretty print of the superblock) for an existing array
> > somehow?  I couldn't find anything in the mdadm man page for it.
> 
> mdadm -E /dev/sda
> 
> will print the metadata on device /dev/sda which describes the array that it
> is a member of.

Ok, that includes the information I was looking for, including the
chunk size, and layout.

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