bdf and df -k give different results for total available

[Martin Johnson]

Can anyone explain why the total available space is different for bdf and df -k?

Here is an example:

bdf /
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 147456 49873 91722 35% /

df -k /
/ (/dev/vg00/lvol3 ) : 141595 total allocated Kb
91722 free allocated Kb
49873 used allocated Kb
35 % allocation used

91722+49873=141595 How come bdf reports 147456?

Thanks
Marty

[PIYUSH D. PATEL]

Hi,

du shows the number of currently allocated blocks and counts the blocks you've just deleted as free.

bdf shows the free disk space available.

The difference is that if a active process has allocated blocks eg for a logfile that you've just deleted "bdf" counts these as still occupied. This wont change until the process closes the file ("deallocates the blocks") as it usually happens when the process terminates.

du adds up all the files and then shows the results. Hence the size shown bu du will be less.

Piyush

[Martin Johnson]

Piyush,

I am using the "df" command, not "du".

Marty

[PIYUSH D. PATEL]

Hi,

Sorry !!!

df reports the total size minus the 'minfree %'

bdf reports the total size

bdf_total * (100 - minfree %) = df_total

df -t - gives the % minfree


HTH
Piyush

[Martin Johnson]

True, but minfree is for HFS file systems, the default is 10%. This explains the difference in /stand (which I checked on this system is 10%). However, / is vxfs, and the difference is 4%. Why this difference?


Marty

[PIYUSH D. PATEL · Accepted solution]

Hi,

yes you are right.....

There have been lot of questions regarding this in the forums.

Pls go thro this link...it may explain you in much details....

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x81ac72234586d5118ff00090279cd0f9,00.html

Piyush

[Martin Johnson]

Leave it to Bill to come up with the answer. Too bad he didn't get any point for it.


Marty

[PIYUSH D. PATEL]

Hi Marty,

True !!!

Lots of hidden fundas in HPUX.

Piyush