NFSv4 and high-availability

NFSv4 and high-availability

[Lukas Hejtmanek]

Hello,

are there currently any options for HA setups with NFSv4? Is it possible to
migrate an NFSv4 klient from one server to another one on the fly? (Without
remount, closing all apps, and so on, in the case that all NFSv4 servers share
the same storage).

I know it could be possible to migrate IP address from a crashed NFSv4 server
to another one, but this solution seems to be a last resort for us. Are there
any options client based?

-- 
Lukáš Hejtmánek

Re: NFSv4 and high-availability

[Michael Schwartzkopff]

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> Hello,
> 
> are there currently any options for HA setups with NFSv4? Is it possible to
> migrate an NFSv4 klient from one server to another one on the fly? (Without
> remount, closing all apps, and so on, in the case that all NFSv4 servers
> share the same storage).
> 
> I know it could be possible to migrate IP address from a crashed NFSv4
> server to another one, but this solution seems to be a last resort for us.
> Are there any options client based?

Yes. You can setup a NFSv4 cluster using a cluster manager like pacemaker.

Last time I set it up there were some issues with locking and timeouts. I 
don't know if this is already fixed. I'd have to try it myself again.

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
Fax: (089) 620 304 13

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Re: NFSv4 and high-availability

[Lukas Hejtmanek]

On Thu, Jan 19, 2012 at 03:52:30PM +0100, Michael Schwartzkopff wrote:
> Yes. You can setup a NFSv4 cluster using a cluster manager like pacemaker.
> 
> Last time I set it up there were some issues with locking and timeouts. I 
> don't know if this is already fixed. I'd have to try it myself again.

but this seems to be the mentioned server side HA mode. But can I move running
client to another server (with anoter different IP)?

-- 
Lukáš Hejtmánek

Re: NFSv4 and high-availability

[Malahal Naineni]

Lukas Hejtmanek [xhejtman@ics.muni.cz] wrote:
> On Thu, Jan 19, 2012 at 03:52:30PM +0100, Michael Schwartzkopff wrote:
> > Yes. You can setup a NFSv4 cluster using a cluster manager like pacemaker.
> > 
> > Last time I set it up there were some issues with locking and timeouts. I 
> > don't know if this is already fixed. I'd have to try it myself again.
> 
> but this seems to be the mentioned server side HA mode. But can I move running
> client to another server (with anoter different IP)?

Not possible today. There are some patches out there for migration but
you will have to wait until some current problems with migration are
resolved and the solution gets accepted upstream.