Re: file/directory/device services

[Martin Pala]

df reports blocks free for non-superuser and uses 1k blocks, monit uses 
1m blocks.

df to monit key:

1.) total blocks:
1k-blocks=25197220 => 25197220/1024 = 24606.7 MB (equal to monit report)

2.) Available blocks (for non-superuser):
1k-blocks=17318780 => 17318780/1024 = 16912.9 MB (equal to monit report)


Non-superuser free percentage is 68.73%: 4329703/62993.05 == 
16912.9/246.067 == 17318780/251972.2 = 68.73

I used presumption that the usage is the usage of non-superuser 
available space:

100% - 68.73% = 31.27% (this is non-superuser available space usage)

the real (total) usage is:

100% - 73.81% = 26.19% (this is total space usage - only root is allowed 
to use the rest)

I can fix it to report and utilize total usage, however for the user 
must be aware and set the monitoring limit to reflect superuser reserved 
blocks => though the filesystem could have free reserved blocks, 
non-superuser could fail to write because of space usage.

Though this problem/conflict, there is still percentage difference from 
df, i don't know the reason - it seems that monit is reporting the 
percentage well and there is some strange reason in df for this output 
(if you'll look above on the percentage, you can see that the monit 
result is corect).


What do you think, shall i change it?

Martin

Jan-Henrik Haukeland wrote:

> I also noticed that the numbers from df and from monit for my harddisk
> are different; about 1 Gigabyte. Do you know what the reason could be?
>
>
> hauk:[~]df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/hda5             25197220   6598464  17318780  28% /
>
> monit:
>
> status:
> Device 'disk' is accessible
>        Space: 31.3% [7693.8 MB] Inodes: 8.4% [269686 objects]
>
> HTML:
> Blocks total                    6299305 [24606.7 MB]
> Blocks free for non superuser   4329703 [16912.9 MB] [68.7%]
> Blocks free total               4649697 [18162.9 MB] [73.8%]
> Block size                      4096 B
> Inodes total                    3204992
> Inodes free                     2935306 [91.6%]
>