Don't understand df/du output

2011-08-12 Thread Alain AUDEBERT aka 2A
Hello list,

I having a problem to understand the output of du and df command :

[root@ftp ~]# df -h /opt/
FilesystemSizeUsed   Avail Capacity  Mounted on
/dev/xbd6 387G342G 13G96%/opt

[root@ftp ~]# du -sh /opt/
342G/opt/

But 387Go - 342Go not equal to 13Go ! Where's the available space ?
(same thing with df -k)

I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
Is it the 8% reserved by FFS ?

Regards,

Alain

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Re: Don't understand df/du output

2011-08-12 Thread Polytropon
On Fri, 12 Aug 2011 23:58:12 +0200, Alain AUDEBERT aka 2A wrote:
 Hello list,
 
 I having a problem to understand the output of du and df command :
 
 [root@ftp ~]# df -h /opt/
 FilesystemSizeUsed   Avail Capacity  Mounted on
 /dev/xbd6 387G342G 13G96%/opt
 
 [root@ftp ~]# du -sh /opt/
 342G/opt/
 
 But 387Go - 342Go not equal to 13Go ! Where's the available space ?
 (same thing with df -k)
 
 I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
 Is it the 8% reserved by FFS ?

See:
http://www.freebsd.org/doc/en/books/faq/disks.html#DU-VS-DF



-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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Re: Don't understand df/du output

2011-08-12 Thread Alain AUDEBERT aka 2A

Le 13 août 2011 à 00:35, Polytropon a écrit :

 On Fri, 12 Aug 2011 23:58:12 +0200, Alain AUDEBERT aka 2A wrote:
 Hello list,
 
 I having a problem to understand the output of du and df command :
 
 [root@ftp ~]# df -h /opt/
 FilesystemSizeUsed   Avail Capacity  Mounted on
 /dev/xbd6 387G342G 13G96%/opt
 
 [root@ftp ~]# du -sh /opt/
 342G/opt/
 
 But 387Go - 342Go not equal to 13Go ! Where's the available space ?
 (same thing with df -k)
 
 I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
 Is it the 8% reserved by FFS ?
 
 See:
 http://www.freebsd.org/doc/en/books/faq/disks.html#DU-VS-DF


Thank for the link, but in my case du and df are the same used output, and it's 
not an rm, I launch lsof and no process with a big file :-/

Regards,
Alain
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Re: Don't understand df/du output

2011-08-12 Thread Rodrigo Gonzalez

On 08/12/2011 06:58 PM, Alain AUDEBERT aka 2A wrote:

Hello list,

I having a problem to understand the output of du and df command :

[root@ftp ~]# df -h /opt/
FilesystemSizeUsed   Avail Capacity  Mounted on
/dev/xbd6 387G342G 13G96%/opt

[root@ftp ~]# du -sh /opt/
342G/opt/

But 387Go - 342Go not equal to 13Go ! Where's the available space ?
(same thing with df -k)

I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
Is it the 8% reserved by FFS ?

Yes

read http://www.freebsd.org/doc/en/books/faq/disks.html

Question *9.27* (last one)



Regards,

Alain



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Re: Don't understand df/du output

2011-08-12 Thread Adam Vande More
On Fri, Aug 12, 2011 at 4:58 PM, Alain AUDEBERT aka 2A de...@me.com wrote:

 Is it the 8% reserved by FFS ?


http://www.freebsd.org/doc/en/books/faq/disks.html#MANUFACTURER-DISK-SIZE

-- 
Adam Vande More
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Re: Don't understand df/du output

2011-08-12 Thread Alain AUDEBERT aka 2A
 I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
 Is it the 8% reserved by FFS ?
 Yes
 
 read http://www.freebsd.org/doc/en/books/faq/disks.html
 
 Question 9.27 (last one)


Hi Rodrigo,

Ok, so I understand why the free space is not equal to : available - used

But in this case why when I turned the minfree space at 1% with tunefs there is 
no change ??
This point I don't understand

About manufacturer the volume make 400Go, and appears like 393Go :)

Thank you all

Alain

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Re: Don't understand df/du output

2011-08-12 Thread Alain AUDEBERT aka 2A
 I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
 Is it the 8% reserved by FFS ?
 Yes


Maybe it's important, but it's not an hard disk, just a Xen volume !
So maybe we can't tunefs it ?

Regards,
Alain

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Re: Don't understand df/du output

2011-08-12 Thread Rodrigo Gonzalez


On 08/12/2011 08:14 PM, Alain AUDEBERT aka 2A wrote:

I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
Is it the 8% reserved by FFS ?

Yes


Maybe it's important, but it's not an hard disk, just a Xen volume !
So maybe we can't tunefs it ?

Unfortunately I cannot answer that :(


Regards,
Alain



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