On Fri, Oct 2, 2009 at 6:18 AM, Dave Howorth <[email protected]>wrote:
>
> I think if you ask du to tell you the size of just one particular
> snapshot, it will give you a realistic answer for what would be left if
> you deleted all the other snapshots. That's the easiest way to know the
> size that I'm aware of.
>
Right---it's worth remembering, and a little surprising at first, that 'du'
is not distributive ('du dirA dirB' is not necessarily 'du dirA' + 'du
dirB'). If we create two directories and hardlink files from one to the
other, we get:
du -h
1.1M ./dirA
4.0K ./dirB
1.1M .
du -h dirA
1.1M dirA
du -h dirB
1.1M dirB
Note that you can't tell which directory is the 'owner' of the data: it's
simply counted against the first directory it's found in:
du -h dirB dirA
1.1M dirB
4.0K dirA
du -h dirA dirB
1.1M dirA
4.0K dirB
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