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Some problem about the xfs_db??

To: xfs@xxxxxxxxxxx
Subject: Some problem about the xfs_db??
From: "Vincent,Wei" <weikun0905@xxxxxxxxx>
Date: Tue, 15 Mar 2011 14:46:04 +0800
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Hi all
     I used the xfs_db to check the fragment about my disk.
First I had format the disk,then I try to write the file on it.
5min later, we use df -h to check:
/dev/sda1               465.6G    295.4M    465.3G   0% /mnt/hdd0
Now I use the :
xfs_db -c frag  -r /dev/sda1
actual 616, ideal 30, fragmentation factor 95.13%
why?? this is nearly a new disk!!! How can it so many fragments?
Thanks for your help!!
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