Re: [Moosefs-users] How to calculate the memory should prepare for the master server?

[Laurent W. <lw...@hy...>]

On Tue, 15 Jun 2010 13:36:03 +0800
Roast <zha...@gm...> wrote:

> Hello, everyone.
Hi Zhang,
> 
> We are plan to use moosefs at our product environment as the storage of our
> online photo service.
> 
> But since we got that master server store all the metadata at memory, but we
> will store for about a hundred million photo files, so I wonder how much
> memory should prepare for the master server? And how to calculate this
> number?
According to FAQ, http://www.moosefs.org/moosefs-faq.html#cpu , at
gemius, 8GB ram is used by master for 25 millions files. So, for
a hundred millions, you'd need 32GB.
> 
> If the memory is not enough, what will happened with master server's?
I guess it'll swap.
> 
> And I still wonder the performance about master server when use moosefs to
> store a hundred million photo files? Anyone can give me some more
> information?
I've no experience with such a large setup. I guess memory caching used
to prevent bottleneck on master will still do the trick.
regards,
-- 
Laurent Wandrebeck
HYGEOS, Earth Observation Department / Observation de la Terre
Euratechnologies
165 Avenue de Bretagne
59000 Lille, France
tel: +33 3 20 08 24 98
http://www.hygeos.com
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