Re: [ENBD] is raid of raid possible ?

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Not sure if this is relevant, but we've been running a 52-disk Linux
software RAID10 array since January with no isssues re: deadlocking.  I
patched our kernel to use seq_file for /proc/mdstat, but other than
that, I'm using a 'standard' Red Hat kernel.  I cannot comment on ENBD
as I have never used it.  

I may be an exception and not the rule, but I haven't heard of anyone
complaining about RAID on RAID on this list and from my personal
experience it has been stable.

Regards,
Andy.

On Mon, 2003-07-14 at 07:21, Bernd Schubert wrote:
> On Friday 11 July 2003 16:57, Peter T. Breuer wrote:
> > "A month of sundays ago Ulrich Hahn wrote:"
> >
> > > scheme-1 and scheme-2 with software-raid on the fall-back-server will
> > > not work out. I'm not sure if sw-raid over sw-raid is prone to deadlocks
> > > (Peter?), but the tests I did showed that extremly low rebuild-rates,
> > > even
> >
> > It's impossible to say. The raid code is sophisticated = obscure.
> > I think there are no deadlocks - it maintains a separate local cache
> > of request structs per device, as I recall. Ummmm ... but what about
> > buffers? It may maybe deadlock for buffers if there is enough copying
> > and it's done synchronously ...
> >
> > > with tuned md-parameters, will make any medium sized raid unusable.
> >
> 
> Thanks Ulrich and Peter for your answers and help, that helps me a lot for our 
> future plans.
> 
> Best regards,
> 	Bernd
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-- 
Andrew Rechenberg <arechenberg@shermfin.com>
Infrastructure Team, Sherman Financial Group
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