Re: Usage bigger after copy?

From: Wayne Walker <wwalker@crossroads.com>
To: xfs@oss.sgi.com
Subject: Re: Usage bigger after copy?
Date: Mon, 15 Oct 2012 14:52:43 -0500	[thread overview]
Message-ID: <507C698B.1020801@crossroads.com> (raw)
In-Reply-To: <2368408.eSeMIOhpGu@saturn>

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Michael,

My guess is that you used rsync but did not use H.

retry your rsync with:

rsync -aHx /usr /1/

H will preseve hard links for you and probably make most of your 
directory size differences go away.

Wayne

On 10/15/2012 01:07 PM, Michael Monnerie wrote:
> I know that the speculative prealloc of xfs can make files bigger on a
> destination, but I thought an "echo 3 >/proc/sys/vm/drop_caches" would
> help. I even umounted both filesystems, but the destination is bigger:
>
> sys1 Blocks 8378368 Used 2631368 Avail 5747000
> sys2 Blocks 8378368 Used 2966566 Avail 5411812
>
> Both are VMs, have a 16G disk, partitioned same size, both on LVM,
> copied with rsync. xfs_info show the same for both:
>
> meta-data=/dev/mapper/dns1--system-root isize=256    agcount=4,
> agsize=524288 blks
>           =                       sectsz=512   attr=2
> data     =                       bsize=4096   blocks=2097152, imaxpct=25
>           =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=2560, version=2
>           =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0
>
> So why is there such a huge diff in size? 300M, 2.6G:2.9G, is a big
> number. I found these dirs to be very different:
>
> ( I rebooted here compared to results before, but same strangeness )
> # du -s /1/usr/lib/locale/* /usr/lib/locale/*|sort -n|grep YU
> 20      /usr/lib/locale/sh_YU.utf8
> 1760    /1/usr/lib/locale/sh_YU.utf8
>
> But comparing them directly, they are the same:
>
> # du -s /1/usr/lib/locale/sh_YU.utf8 /usr/lib/locale/sh_YU.utf8
> 1760    /1/usr/lib/locale/sh_YU.utf8
> 1760    /usr/lib/locale/sh_YU.utf8
>
> So what makes "du" show a huge different when the dir above gets
> scanned, versus when you compare dirs directly?
>
>
>
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