Re: [zfs-discuss] What are .$EXTEND directories?

[Alan Wright]

On 1/3/11 10:51 AM, Chris Ridd wrote:
> On 3 Jan 2011, at 17:08, Volker A. Brandt wrote:
>
> > > On our build 147 server (pool version 22) I've noticed that some directories called 
> > > ".$EXTEND" (no quotes) are appearing underneath some shared NFS filesystems, containing 
> > > an empty file called "$QUOTA". We aren't using quotas.
> > >
> > > What are these ? Googling for the names doesn't really work too well :-(
> > >
> > > I don't think they're doing any harm, but I'm curious. Someone's bound to
> > > notice and ask me as well :-)
> >
> > Well, googling for '.$EXTEND' and '$QUOTA' does give some results,
> > especially when combined with 'NTFS'. :-)
>
> Aha! Foolishly I'd used zfs in my search string :-)
>
> > Check out the table on "Metafiles" here:
> >
> >   http://en.wikipedia.org/wiki/NTFS
>
> OK, so they're probably an artefact of having set sharesmb=on, even though I've 
> not joined the box to a domain yet.

Those objects are created automatically when you share a dataset
over SMB to support remote ZFS user/group quota management from
the Windows desktop.  The dot in .$EXTEND is to make the directory
less intrusive on Solaris.

There is no Solaris or ZFS functionality associated with those
objects and you can safely delete them on ZFS: they will be
recreated as required whenever the dataset is shared over SMB.

For more information on those files, look for Quota Tracking in
http://msdn.microsoft.com/en-us/library/ms995846.aspx

Alan
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