Mounting multiple NFS shares to the same point

[Tillman Hodgson]

On Tue, Feb 13, 2007 at 12:24:03PM +0000, Alex Zbyslaw wrote:
> Tillman Hodgson wrote:
> 
> >If that still holds true in the -current src, the second mount will
> >*definitely* cause me backup problems. I may have to move to keeping the
> >NFS export always mounted, which is not ideal.
>
> Could you use something like ssh to transfer the files rather than 
> needing NFS?  (I don't know if you mentioned what the NFS-end box was...).

That's a good idea. In this case the NFS-end box is an Infrant appliance
so I don't think I can use scp. I'll check deeper into it -- if it can
do scp, that gives me more options.

> I'm also not clear why you think that keeping the NFS partition mounted 
> all the time is so bad.  If there is no access then surely the overhead 
> is minimal.

That's true, there's no real performance hit. It's not the overhead I'm
worried about, it's minimizing the exposure of the backups volume to
problems. A network filesystem that isn't mounted is one that's much
harder to accidently rm files from and such :-)

> Your other alternative is to use lockfiles to control when things get 
> mounted/unmounted.  If the control file is locked, you wait until it's 
> unlocked (or bomb with an error, whatever).  Trivial in perl, and 
> lockf(1) looks like the way to go with shell.

That's the scripting magic that I mentioned. It looks like this is
likely the best solution with my current volume arrangement. In
hindsight, I think should've used three shares instead of one and then
the daily, weekly and monthly mounts wouldn't conflict with each other.

-T


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