Re: COW fs (Re: Editing-in-place of a large file)

[Pavel Machek]

Hi!
> > le dim 09-09-2001 at 18:30 John Ripley a _rit :
> > 
> > > /dev/sda6 - /tmp      -  210845 blocks,  17697 duplicates,  8.39%
> > > /dev/sda7 - /var      -   32122 blocks,   5327 duplicates, 16.58%
> > > /dev/sdb5 - /home     -  220885 blocks,  24541 duplicates, 11.11%
> > > /dev/sdc7 - /usr      - 1084379 blocks, 122370 duplicates, 11.28%
> > 
> > How many of these blocks actually belong to file data ?
> 
> Hmm, good point:
> 
> Filesystem         1024-blocks  Used Available Capacity Mounted on
> /dev/sda6             841616    4508   837108      1%   /tmp
> /dev/sda7             124407   63774    54209     54%   /var
> /dev/sdb5             855138  677328   177810     79%   /home
> /dev/sdc7            4191237 3946214   245023     94%   /usr
> 
> My thinking was that I've managed to run out of space on all of the
> partitions in the past and had to prune a lot of stuff... so nearly all
> the blocks should contain at least some "likely" data. Still, I guess I
> need to verify that this isn't distorting the results. The program needs
> to recurse over all files on the filesystem rather than all blocks on a
> partition.
just cat /dev/urandom > file to fill it with garbage
-- 
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details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.