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Re: [Linux-cluster] Asking information about NFS /CS4 Cookbook



Lon Hohberger wrote:
> On Wed, May 16, 2007 at 11:04:41AM +0200, Alain Moulle wrote:
>   
>> how could it
>> be "without detecting  when a failure occurs" ?
>> Sure I miss something somewhere ?
>>     
>
> A 'managed NFS service' needs to include a 'managed virtual IP'.
> Clients always access using the same IP.
>
>   
Hi Lon,
How do nfs clients behave during this failover/server change?
To be more specific, :
- does the choice UDP vs TCP and nfs v3 vs v4 make a difference in how
much time it takes for clients to be serviced by the new server?
- can the client handle the change gracefully so that
there will be no "stale nfs handle"?

On the server side :
- When the exported filesystem is non-cluster (e.g. ext3), how does the
server handle locking issues? If an nfs-client is locking a file, can
the server (in Managed NFS service) forcefully unmount the file system,
considering that the nfs daemon is kernel-space, so that it can't be killed?
- Can the client gracefully handle new, failover,  nfs clients, since
some nfs information is stored on /var/lib/nfs, which is on a local file
system?

Regards,

Fajar


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