[3965] in arla-drinkers
Re: is cache-only-prefixes an nnpfs limitation?
daemon@ATHENA.MIT.EDU (Pavel Cahyna)
Wed Jun 21 05:21:17 2006
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Date: Wed, 21 Jun 2006 11:21:06 +0200
From: Pavel Cahyna <pcah8322@artax.karlin.mff.cuni.cz>
To: arla-drinkers@stacken.kth.se
Subject: Re: is cache-only-prefixes an nnpfs limitation?
Message-ID: <20060621092106.GC12107@artax.karlin.mff.cuni.cz>
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Hello,
sorry for replying to this old thread...
On Sun, Apr 09, 2006 at 10:00:09PM +0200, Tomas Olsson wrote:
> Adam Megacz <megacz@cs.berkeley.edu> writes:
> > - Do remote-filesystem file have to map 1:1 exactly to local files?
> > Or do remote blocks map to local files? Or do remote blocks map
> > to local blocks?
> >
> Traditionally it's 1:1 for data, plus possibly some lookup sugar. nnpfs
> just has one "cache file" handle per fid.
>
> For the current block prototype we use the same idea, but just split data
> in fixed size chunks in the simplest possible way and use those cache files
> as we use the single file today. The chunk size is configurable but
> assumed to be a power of 2. For some reason I'm also assuming a 1:1
> mapping between (fid, offset) and cache "block" file.
I have an idea, could the 1:1 mapping stay, with the cache file becoming a
"sparse file"? The "holes" would fill the part of the cache file that
does not contain valid data.
Pavel Cahyna
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