linux-ext4 - Re: [Bug 13930] New: non-contiguous files (64.9%) on a ext4 fs

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Date:	Fri, 07 Aug 2009 12:58:53 -0600
From:	Andreas Dilger <adilger@....com>
To:	zelogik+bugzilla@...il.com
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [Bug 13930] New: non-contiguous files (64.9%) on a ext4 fs

On Aug 07, 2009  09:58 +0000, bugzilla-daemon@...zilla.kernel.org wrote:
> Normally ext4 is a perfect non-contifuous FS ... so why when I make an:
> 
> sudo e2fsck -v -f -p /dev/sdc1
> 
>    15953 inodes used (0.03%)
>    10361 non-contiguous files (64.9%)
> 
> We have 64.9% of non-contiguous files on a ext4 fs, 
> 
> Files have been transfered from a cifs mount (useful ?) and files size are
> [2-10]|[600-800]MB

Note that the largest single extent in ext4 is 128MB, so it is perfectly
normal to have fragmented files if they are 600MB in size.  Maybe we should
change the e2fsck stats to not consider a file fragmented if it fills the
whole block group (less any metadata therein)?

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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