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Jim Byrnes 09-10-2012 07:03 PM

Calculating the size of /
 
In another thread I was trying to calculate how much disk space to
allocate to / if I did a fresh install and this time setup a separate
/home partition.


To get an idea of how much was outside of the home folder on my present
install I did:


sudo du -shc / => 105GB
du -shc /home => 64GB

This led me to believe I had 105GB - 64GB = 41GB that would be in /.

Colin suggested I run Disk Usage Analyzer:

Total filesystem capacity: 264.7GB(used: 104.5GB avail: 160.2GB

/ 100% 75.3GB
home 84.1% 63.3GB
usr 6.7% 5.0GB
var 5.8% 4.4GB
lib 2.1% 1.6GB
opt 1.0% 762.2MB
boot 0.3% 194.6MB

Everything else was 0.0%

So this seems to say that if I had a separate /home on this machine that
/ would be 12GB not the 41GB calculated above.


So what accounts for the difference of 29.2GB between the used of
104.5GB and / of 75.3GB?


The 12GB and 29.2GB = the 41GB I originally calculated would be needed
for /. 12GB seems to be more in line with what others reported as the
size needed for /.


Regards, Jim


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Gilles Gravier 09-10-2012 07:15 PM

Calculating the size of /
 
Adding -x to du tells it so skip directories on different filesystems...
Should give you what you want.

> sudo du -shcx /

Gilles.



On 10/09/2012 21:03, Jim Byrnes wrote:
> In another thread I was trying to calculate how much disk space to
> allocate to / if I did a fresh install and this time setup a separate
> /home partition.
>
> To get an idea of how much was outside of the home folder on my
> present install I did:
>
> sudo du -shc / => 105GB
> du -shc /home => 64GB
>
> This led me to believe I had 105GB - 64GB = 41GB that would be in /.
>
> Colin suggested I run Disk Usage Analyzer:
>
> Total filesystem capacity: 264.7GB(used: 104.5GB avail: 160.2GB
>
> / 100% 75.3GB
> home 84.1% 63.3GB
> usr 6.7% 5.0GB
> var 5.8% 4.4GB
> lib 2.1% 1.6GB
> opt 1.0% 762.2MB
> boot 0.3% 194.6MB
>
> Everything else was 0.0%
>
> So this seems to say that if I had a separate /home on this machine
> that / would be 12GB not the 41GB calculated above.
>
> So what accounts for the difference of 29.2GB between the used of
> 104.5GB and / of 75.3GB?
>
> The 12GB and 29.2GB = the 41GB I originally calculated would be needed
> for /. 12GB seems to be more in line with what others reported as the
> size needed for /.
>
> Regards, Jim
>
>

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