[OpenAFS] Dummy fileserver putting clients 'on hold'

[Nathan Davis]

Why not migrate everything to another machine, perform your upgrade, 
then migrate everything back when the machine is ready again?

Rainer Toebbicke wrote:

> Before re-inventing the wheel:
>
> has anybody got an AFS fileserver that refuses all requests in such a 
> way that clients wait and retry?
>
> I'm thinking of something that replaces the standard fileserver for 
> just a few minutes and puts everbody on 'hold the line, please' in 
> order to allow for short operations which would otherwise require 
> scheduling outage, stopping batch well before, etc.
>
> I wonder whether it would be sufficient to take the standard 
> fileserver and mess around until it returns VBUSY on just about every 
> request.
>
> Our target in this case: RAID controller firmware upgrade, which 
> requires unmounting and resetting the RAIDs, but why not do something 
> similar while e.g. the salvager has its hour or so of glory provided 
> that accesses to R/Os don't get blocked?
>
> -- 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 
>
> Rainer Toebbicke        http://cern.ch/~rtb         rtb@mail.cern.ch  O__
> European Laboratory for Particle Physics(CERN) - Geneva, Switzerland   
> > |
> Phone: +41 22 767 8985       Fax: +41 22 767 7155                     
> ( )\( )
>
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