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Date: Mon, 18 Nov 2002 16:44:08 +0100
From: =?iso-8859-1?Q?Ragnar_Kj=F8rstad?= <kernel@ragnark.vestdata.no>
To: Rashmi Agrawal <rashmi.agrawal@wipro.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Failover in NFS
Message-ID: <20021118164408.B30589@vestdata.no>
References: <3DD90197.4DDEEE61@wipro.com>
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In-Reply-To: <3DD90197.4DDEEE61@wipro.com>; from rashmi.agrawal@wipro.com on Mon, Nov 18, 2002 at 08:34:55PM +0530
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On Mon, Nov 18, 2002 at 08:34:55PM +0530, Rashmi Agrawal wrote:
> 1. I have a 4 node cluster and nfsv3 in all the nodes of cluster with
> server running in one
> of the 2 nodesconnected to shared storage and 2 other nodes are acting
> as clients.
> 2. If nfs server node crashes, I need to failover to another node
> wherein I need to have access
> to the lock state of the previous server and I need to tell the clients
> that the IP address of the
> nfs server node has changed. IS IT POSSIBLE or what can be done to
> implement it?

No, you need to move the IP-address from the old nfs-server to the new
one. Then to the clients it will look like a regular reboot. (Check out
heartbeat, at http://www.linux-ha.org/)

You need to make sure that NFS is using the shared ip (the one you move
around) rather than the fixed ip. (I assume you will have a fixed ip on
each host in addition to the one you move around). Also, you need to put
/var/lib/nfs on shared stoarage. See the archive for more details.



-- 
Ragnar Kj?rstad
Big Storage
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