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Re: Usage bigger after copy?

To: <xfs@xxxxxxxxxxx>
Subject: Re: Usage bigger after copy?
From: Wayne Walker <wwalker@xxxxxxxxxxxxxx>
Date: Mon, 15 Oct 2012 14:52:43 -0500
In-reply-to: <2368408.eSeMIOhpGu@saturn>
References: <2368408.eSeMIOhpGu@saturn>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0
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="" isize=256    agcount=4, 
agsize=524288 blks
         =                       sectsz=512   attr=2
data     =                       ""   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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