[mythtv-users] disk usage weirdness <- maybe this is it
Bill Chmura
Bill at Explosivo.com
Fri Apr 23 14:35:25 EDT 2004
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For example, a megabyte = 1,048,576 bytes.
So the 54218MB = 56,851,693,568
(Which is similar to the 56G)
But thats where it breaks down... if you convert it to GB like:
56 851 693 568 / 1 073 741 824 = 52.9472656
Its off again.
I took a look at my machine and while I am not sure how Myth approaches it...
here is what I found:
This is my notebook showing megabytes
wbchmura at loki wbchmura $ df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/hda4 13010 10525 1825 86% /
none 251 0 251 0% /dev/shm
13 010 * 1 048 576 = 13 641 973 760 (Number of bytes)
This is how many GB df reports
wbchmura at loki wbchmura $ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda4 13G 11G 1.8G 86% /
none 251M 0 251M 0% /dev/shm
However if I actually did out the conversion to GB it would not be 13, it
would be 12
(13 010 * 1 048 576) / 1 073 741 824 = 12.7050781
So I am guessing DF just truncates, and thats why you have a discrepency
Before I get flamed, I stress the Guess above...
Bill
On Friday 23 April 2004 10:45 am, Dennis Lou wrote:
> From: Henk Poley <hpoley at dds.nl>
>
> >Op vrijdag 23 april 2004 05:37, schreef Dennis Lou:
> >> I noticed that the backend status reports disk
> >> usage differently than df.
> >>
> >> This is what mythbackend reports:
> >> Disk Usage:
> >> * Total Space: 54,218 MB
> >> * Space Used: 49,745 MB
> >> * Space Free: 4,473 MB
> >>
> >> and this is what df -h reports:
> >> [root at localhost /]# df -h
> >> Filesystem Size Used Avail Use% Mounted
>
> on
>
> >> /dev/hda2 56G 46G 7.3G 87% /
> >> /dev/hda1 99M 14M 80M 15% /boot
> >> none 125M 0 125M 0%
>
> /dev/shm
>
> >Linux automagicaly reserves some space to keep
> >fragmentation low. Only root
> >can use that (that's why df as root reports the full
> >free space). It has been
> >on the list before. There's also some command to
> >disable this barrier for
> >normal users also (don't know if that's smart
>
> though).
>
> Hm, hadn't seen it on the list before...
>
> In any case, df as root gives the same result as
> df as normal user:
>
> $ df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/hda2 56G 48G 5.8G 90% /
> /dev/hda1 99M 14M 80M 15% /boot
> none 125M 0 125M 0% /dev/shm
> $ su
> Password:
> [root at localhost dlou]# df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/hda2 56G 48G 5.8G 90% /
> /dev/hda1 99M 14M 80M 15% /boot
> none 125M 0 125M 0% /dev/shm
>
> Even if you do the math and adjust by 5%, it still
> doesn't add up. Space used is space used. No
> matter the reserve, that particular figure
> shouldn't be different.
>
> Then there's this weirdness:
> # du -sh /
> 30G /
>
> -Dennis
>
>
>
>
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- --
Bill Chmura
w. http://www.fistfullofcode.com
w. http://www.explosivo.com
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