Re: [Sheflug] ReiserFS and ext2 fsck question.

["Chris J/#6" <nospam [at] nccnet.co.uk>]

> I've just looked at this again, and the numbers don't really make much
> sense...
> 
> The ext2 partition is saying it's only using 20k, when it is at the same
> time reporting 27M less available that the size of the disk, whereas the
> reiserfs partition is at least telling the story consistantly...
> 
> What's the crack?

Do "tune2fs -m 0 /dev/hda1" then have a look at the figures :)

The ext2 filesystem has a concept of "reserved blocks", where an amount of 
the disk can be reserved for user by a single user or group - normally UID 0, 
and GID 0 (root:root), but this can be changed with tune2fs.

This allows a priviledged user to do things on a file system and hence any 
malicious users can't cause a DoS by filling the disk up - they'll 
inconvinience[1] other users, but that want stop the sys admin doing their 
job :)

What the tune2fs command above does is it sets the reserved blocks to zero, 
giving all space to all users. With reserved blocks, df can report funny 
numbers - 100% is when all the user space is taken...so the %usage can report 
110% or whatever when the disk is full and root is using their reserved space 
:)

Chris...
[1] I'm sure that's spelt wrong and I still can't quite remember how it 
should be spelt. Knew I should have drawn that pentagram to help me spell 
better :-)



-- 
Chris Johnson            \  "If not for me then, do it for yourself. If not
sixie@nccnet.co.uk        \  for then do it for the world." -- Stevie Nicks
www.nccnet.co.uk/~sixie/   ~---------------------------------------+
Redclaw chat - http://redclaw.org.uk - telnet redclaw.org.uk 2000   \______


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