Correct way of calculating free space?

[MofTot]

Dear all

On the Foxsat-HDR, the box, stat, df and SMB don't agree on how much free space for recordings is available.

Example:

Box: Video: Used = 852.4GB, Free = 103.4GB.

stat: 4096 233362847 25247205: Used = 890.21GB, Free = 96.31GB.

df: 933451388 832462568 53572172 94% /mnt/hd3: Used = 890.21GB, Free = 51.09GB.

SMB: Free = 51.0GB.

0.ts: 17.83GB.

Who is right?

Cheers

 

[Black Hole]

You might want to check the entry "KiB" in my Glossary (click) - you can be sure Humax is using the "optimistic" version of GB.

 

[MofTot]

That might be, but it doesn't explain why stat reports almost 89% more free space than df and SMB?

 

[MartinLiddle]

That might be, but it doesn't explain why stat reports almost 89% more free space than df and SMB?

I suspect the explanation is the 5% of the capacity reserved for the root user by default on am ext3 file system; see for instance http://unix.stackexchange.com/questions/7950/reserved-space-for-root-on-a-filesystem-why In this case it will be available for use as I think the Humax software runs as root.

 

[MofTot]

Thank you, that makes sense and in fact 5% would be about 50GB so the numbers add up with this in mind.

I'll experiment with creating temporary files and test how far I can push the storage in terms of still being able to record.

 

[MofTot]

Confirming that stat provides the correct information, df and SMB report free space without taking the 5% into account.