Re: Stopping NFS, ip address take over, zero-copy NFS for 2.4.21, and misc

[James Pearson <james-p@moving-picture.com>]

Chris Worley wrote:
>
> 2) IP address takeover between NFS servers.
> 
> With NFS stateless, and not running lock servers, I thought a simple IP
> address takeover scheme (when an I/O server goes down, another just adds
> the failed server's IP address as a virtual interface) would allow
> clients to immediately renegotiate with the same IP address pointing to
> another NFS server (serving the same partitions).  The take-over is
> successful: the clients can communicate with the new I/O server, but I
> get "permission denied" (as root or otherwise) on the NFS mounted
> partitions most of the time (sometimes it works).
> 
> What am I missing?

I don't know a lot about NFS fail over, but I guess unless the take-over 
server has a copy (or the same copy) of /var/lib/nfs/rmtab, then you 
will get "permission denied" - the server needs an entry for each 
client. I guess it works some of the time as the take-over server has a 
'valid' entry in its rmtab file for that client.

James Pearson



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