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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <20090807185853.GK3340@webber.adilger.int>
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.

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html