[Lustre-discuss] querying a MGS

[Andreas Dilger]

On Sep 15, 2008  20:14 -0400, Mag Gam wrote:
> This is perhaps the best and cleanest way to do this. But it seems I
> would need root access, right?

No, the files in this directory can be read by any user that can access
the MDS node.

> On Mon, Sep 15, 2008 at 5:22 PM, Andreas Dilger <adilger at sun.com> wrote:
> > On Sep 15, 2008  06:02 -0400, Mag Gam wrote:
> >> Hmm, where can I start looking into that? I would like to do this. I
> >> can contribute to the Wiki :-)
> >
> > The code used by the liblustre mount (lustre/lib/lustre/super.c) would be
> > the place to start for a userspace solution.  That said, I don't know that
> > this is trivial work.
> >
> > You would likely be much better off to do something like ssh over to
> > the MGS node and look at the /proc/fs/lustre/mgs/MGS/live/ directory
> > to list the currently available filesystems.
> >
> >> On Mon, Sep 15, 2008 at 2:27 AM, Andreas Dilger <adilger at sun.com> wrote:
> >> > On Sep 14, 2008  11:39 -0400, Mag Gam wrote:
> >> >> Is it possible to query a MGS by a client who does not have a lustre
> >> >> filesystem mounted? I am trying to find out what filesystems are being
> >> >> hosted on a particular MGS without trying to mount on a client. Is
> >> >> that possible?
> >> >
> >> > Not currently.  It would be possible to write a small piece of code
> >> > do that.  There isn't a requirement for a "mounted" filesystem, since
> >> > Lustre itself uses the MGC->MGS connection to retrieve the configuraion
> >> > data it needs to do the mount.
> >
> > Cheers, Andreas
> > --
> > Andreas Dilger
> > Sr. Staff Engineer, Lustre Group
> > Sun Microsystems of Canada, Inc.
> >
> >

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.