[Lustre-discuss] query mds for 'stat' info

[Todd Hartmann]

Have you looked at Robinhood? http://sourceforge.net/projects/robinhood

It does high water mark, and provides a nice interface to query Lustre
metadata information as well.

Todd

On Wed, Sep 16, 2009 at 2:56 AM, Isaac Hailperin <hailperin at zib.de> wrote:
>
> Hello list,
>
> I'd like to implement sliding window and hight water mark deletion on a
> lustre filesystem. For that I need information from all files. A first
> idea was to recursivly traverse the file tree and to a `stat filename`
> for every file to collect the meta data.
>
> Now since in lustre the meta data is stored on the mds, I though that
> maybe there is a more efficient way of collecting the information.
>
> So the question is: is there a way that I could query the mds for the
> information that stat would give me(I need access, modify, creation time
> plus the file size). And if so, can someone guess the performance
> increase of quering the mds directly over using `stat` ?
>
> We are using lustre 1.6.something.
>
> Isaac
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