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List:       linux-ha
Subject:    Re: [Linux-HA] Antw: Re:  problem with nfs and exportfs failover
From:       alain.moulle () bull ! net
Date:       2012-04-17 7:10:04
Message-ID: OF0A2D8B34.E487E03E-ONC12579E3.002601F5-C12579E3.0027120B () bull ! net
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Hi =


Another purpose to set the start/stop of nfsserver in Pacemaker is to be =

able to monitor the nfs services periodically
and take automatically the failover decision/actions in case of problem on =

the nfs services (failover of exportfs, failover of =

virtual IP, etc.)

About lock migration, as far as I know and try, there is no possibility to =

manage nfs locks
migration with v3 clients, my conclusion after experiencing a few months =

ago was that
lock migration can't be managed in a HA NFS active/active configuration =

(meaning with a nfs server on each node) , =

but only in a active/passive configuration, or perhaps with exclusively =

NFS v4 clients ? =

(but I have not yet tried this exclusively v4 configuration)
But perhaps somebody has other experiences and conclusions about HA NFS =

... ?

Regards
Alain =




De :    "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
A :     "General Linux-HA mailing list" <linux-ha@lists.linux-ha.org>
Date :  17/04/2012 08:46
Objet : [Linux-HA] Antw: Re:  problem with nfs and exportfs failover
Envoy=E9 par :    linux-ha-bounces@lists.linux-ha.org



>>> William Seligman <seligman@nevis.columbia.edu> schrieb am 16.04.2012 =

um 18:49
in Nachricht <4F8C4DA6.2060304@nevis.columbia.edu>:

[...]
> - There's a more fundamental question: Why are you placing the =

start/stop of
> your NFS server on both nodes under pacemaker control? Why not have the =

NFS
> server start at system startup on each node?
[...]

Hi!

First I think nfsserver starts up and stops quite fast, and secondly I =

feel worried about lock migration if you move around exports from one =

server to the other. (MHO)

Regards,
Ulrich


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