Re: [Moosefs-users] Local writing and rack awareness?

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

On Sun, 15 Aug 2010 22:55:15 +0300
Stas Oskin <sta...@gm...> wrote:

> Hi.
> 
> I have couple of questions I wanted to ask about MFS:
> 
> 1) In case the MFS chunk-server writes data, does it recognizes this and
> writes to itself first, and also reads from itself first, in order to
> speed-up operations?
hmmmm. master decides where data are to be written. Chunkservers read
or write data when they are commanded. Chunkservers do not, afaik, take
decisions on their own about read or write.
> 
> 2) Also, does MFS support rack awareness, where it replicates the files
> within same sub-net first, and only moves later to other sub-nets?
I think you're doing a mix-up between rack and subnet. you can
perfectly have the same subnet in several racks.
Anyway, rack awareness is not yet implemented. It's on the todo list as
far as I can remember. (can't verify as I can't access web for now).
Hope it helps,
-- 
Laurent Wandrebeck
HYGEOS, Earth Observation Department / Observation de la Terre
Euratechnologies
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