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Re: Strange IDL Help probelm 6.3 [message #52474]

Thu, 08 February 2007 02:49

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

JJ wrote:

>
>> Maybe I try stopping and starting the various nfs services and see if
>> that helps at all.
>
> Hey! Praise the all mighty deity of your choice!
>
> Must have just been NFS in a funky state.
>
> I stopped and restarted the NFS servers and clients and now everything
> works again. Yay! :-)
>
> Thanks Nigel.
>
> -JJ

Good, glad you got it sorted.

NFS and file locking is a mire of obscure problems and nastiness. It relies on a
lock manager running on the NFS server, and this lock manager being able to be
contacted via RPC calls. If the lock manager falls over then all the lock state
is lost and blocking requests for locks will block forever. Firewalls add a
whole new level of murkiness to the problem.

To be fair to NFS, it was never designed to handle file locking. NFS is a
stateless network file system, designed before file locking was introduced to
UNIX in any meaningful way, and file locking is inherently stateful. File
locking isn't really a part of NFS, more recently file locking is handled by
the NLM protocol and the nlockmgr RPC service. This should operate in tandem
with NFS but it is stateful and can fail for various reasons, where NFS, being
stateless, manages to continue in the way it was intended.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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[Message index]

		Re: Strange IDL Help probelm 6.3 By: Nigel Wade on Thu, 08 February 2007 02:49
		Re: Strange IDL Help probelm 6.3 By: David Fanning on Wed, 07 February 2007 10:25
		Re: Strange IDL Help probelm 6.3 By: JJ on Wed, 07 February 2007 09:43
		Re: Strange IDL Help probelm 6.3 By: JJ on Wed, 07 February 2007 09:34
		Re: Strange IDL Help probelm 6.3 By: JJ on Wed, 07 February 2007 09:25
		Re: Strange IDL Help probelm 6.3 By: JJ on Wed, 07 February 2007 09:20
		Re: Strange IDL Help probelm 6.3 By: JJ on Wed, 07 February 2007 09:18
		Re: Strange IDL Help probelm 6.3 By: Nigel Wade on Wed, 07 February 2007 01:40
		Re: Strange IDL Help probelm 6.3 By: JD Smith on Tue, 06 February 2007 16:00
		Re: Strange IDL Help probelm 6.3 By: JJ on Tue, 06 February 2007 14:07
		Re: Strange IDL Help probelm 6.3 By: JJ on Tue, 06 February 2007 12:10

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