From: Frank van Maarseveen <frankvm@frankvm.com>
Subject: Re: mount.nfs: chk_mountpoint()
Date: Thu, 30 Aug 2007 18:16:38 +0200
Message-ID: <20070830161638.GA13213@janus>
References: <46CC884B.1030207@oracle.com> <46CD82A0.1000408@redhat.com>
	<46CDC7D0.6030803@oracle.com> <46CDD069.3070608@redhat.com>
	<46CDE76C.3040800@oracle.com> <46CDEA2E.10902@redhat.com>
	<20070830101249.GA9880@janus> <46D6AFBC.3000208@redhat.com>
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Cc: nfs@lists.sourceforge.net
To: Peter Staubach <staubach@redhat.com>
In-Reply-To: <46D6AFBC.3000208@redhat.com>
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On Thu, Aug 30, 2007 at 07:53:32AM -0400, Peter Staubach wrote:
> Frank van Maarseveen wrote:
> >On Thu, Aug 23, 2007 at 04:12:30PM -0400, Peter Staubach wrote:
> >  
> >>I would guess that not so many people are using the "bg" option,
> >>period.  Many of Linux's customers are ex-Sun customers and they
> >>were educated to use autofs and to move away from and stay away
> >>from static mounts via fstab or vfstab.
> >>
> >>The "bg" option was a hack added to speed up system booting.
> >>    
> >
> >No, it is indispensable to recover properly from a power outage:
> >servers tend to boot slower than clients. Also, it is not unusual to
> >have some minor network/server problems after an outage causing the
> >mount to fail.
> >
> >Without the bg option a temporary power outage may render all client
> >systems unusable.
> 
> And a better solution to this problem is still to use autofs.

Sometimes, but not always.

> 
> That said, what use are the clients _until_ the servers are up?

The point is, you would have to re-issue mount -a whenever a server
starts to honour mount requests again: manual intervention on all
client systems is not really practical with many clients.

> You also get all sorts of benefits such as decreased resource

No, actually the automounter _costs_ resources depending on the situation:
The automatic umount flushes all kinds of caches on the client, requiring
network bandwith after mounting them again.

There is no perfect solution. autofs and statically configured mounts
have both advantages and disadvantages.

-- 
Frank

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