Re: [DISCUSS] xfs allocation bitmap method over linux raid

[David Chinner <dgc@sgi.com>]

On Sun, Jan 28, 2007 at 12:32:23PM +0200, Raz Ben-Jehuda(caro) wrote:
> first many thanks to your reply.
> see bellow.
> 
> On 1/25/07, Nathan Scott <nscott@aconex.com> wrote:
> >Hi Raz,
> >
> >On Wed, 2007-01-24 at 08:34 +0200, Raz Ben-Jehuda(caro) wrote:
> >> David Hello.
> >> I have looked up in LKML and hopefully you are the one to ask in
> >> regard to xfs file system in Linux.
> 
> >
> >OOC, which one?  (would be nice to put an entry for your company
> >on the http://oss.sgi.com/projects/xfs/users.html page).
> >
> >> These servers demand high throughput from the storage.
> >> We applied XFS file system on our machines.
> >>
> >> A video server reads a file in a sequential manner. So, if a
> >
> >Do you write the file sequentially?  Buffered or direct writes?
> does not matter. even command like:
> dd if=/dev/zero of=/d1/xxx bs=1M count=1000
> will reveil extents of size modulo(stripe unit ) !=  0

Did you make the filesystem with a stripe unit set properly?
Can you post the output of 'xfs_info -n /path/to/mntpt'?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group