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Date:      Wed, 04 Oct 2006 13:55:36 +0000
From:      "Honest Qiao" <>
Subject:   FreeBSD 6.1-PRERELEASE : rm swapfile after swapoff can't release the disk space
Message-ID:  <BAY103-F25DF6DB073E8D1F50E5F6BD21D0@phx.gbl>

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Environment: FreeBSD 6.1-PRERELEASE FreeBSD 
6.1-PRERELEASE #0: Fri May 12 12:12:17 CST 2006 i386 

Several months ago , I read the follow article, and add a 12G swapfile. 
The article url is 

The swapfile is /usr/swap0 , and I have a swap mount which size is 2G. 
top show: 
Swap: 14G Total, 14G Free 

Today , I use swapoff /usr/swap0 to disable swapfile , and then rm 
/usr/swap0 was deleted, but its disk space can't release. 
Now, top show: 
Swap: 2048M Total, 2048M Free 

www141# df -hi 
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on 
/dev/amrd0s1a 248M 41M 187M 18% 1609 31413 5% / 
devfs 1.0K 1.0K 0B 100% 0 0 100% /dev 
/dev/amrd0s1f 19G 965M 17G 5% 1737 2636085 0% /db 
/dev/amrd0s1g 19G 12G 5.6G 69% 769803 1868019 29% /home 
/dev/amrd0s1d 248M 43M 185M 19% 585 32437 2% /tmp 
/dev/amrd0s1h 25G 19G 3.4G 85% 354372 3013562 11% /usr 
/dev/amrd0s1e 248M 65M 163M 29% 6430 26592 19% /var 

www141# du -csh /usr 
9.3G /usr 
9.3G total 

www141# mount 
/dev/amrd0s1a on / (ufs, local) 
devfs on /dev (devfs, local) 
/dev/amrd0s1f on /db (ufs, local, soft-updates) 
/dev/amrd0s1g on /home (ufs, local, soft-updates) 
/dev/amrd0s1d on /tmp (ufs, local, soft-updates) 
/dev/amrd0s1h on /usr (ufs, local, soft-updates) 
/dev/amrd0s1e on /var (ufs, local, soft-updates) 

from , df -hi show /usr use 19G 
but, du -csh /usr show use use 9.3G 

Why there has a big difference size between df and du? 
And How to get back the lost disk space?

Also , you can visit it on 


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