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Re: file system defragmentation

To: Cosmo Nova <cs_mcc98@xxxxxxxxxxx>
Subject: Re: file system defragmentation
From: David Chinner <dgc@xxxxxxx>
Date: Wed, 9 Aug 2006 09:34:25 +1000
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <5408752.post@talk.nabble.com>
References: <4f52331f050826001612f8e323@mail.gmail.com> <20050826101131.GA24544@ii.uib.no> <4f52331f0508260848782f240a@mail.gmail.com> <E4E12CD035E14A4AB8C36E0F4B7143F7277DED@iu-mssg-mbx09.exchange.iu.edu> <43112C5D.8090202@sgi.com> <20050828034108.73921.qmail@web34103.mail.mud.yahoo.com> <5408752.post@talk.nabble.com>
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On Wed, Jul 19, 2006 at 09:23:42PM -0700, Cosmo Nova wrote:
> 
> what is the maximum tolerance for the delayed allocations pls? I guess it's
> not possible to buf a GB size file and delay its allocation?

Sure it is. The limit on how much is buffered before writeback (and therefore
allocation) is determined by how much memory you have and your
/proc/sys/vm/dirty* tunable settings. This can range from a few MB to a few TB
of data depending on how big your machine is ;)

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group


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