[Dirvish] Small question on the use of hardlinks in dirvish

Johannes Kastl bierkastl at freenet.de
Sun Jul 9 21:47:26 UTC 2006

Am 09.07.2006 23:05 schrieb Eric Mountain:

> I won't say it's the intended behaviour, but it is definitely the *expected* 
> behaviour of the software dirvish relies upon to perform the backup per se, 
> i.e. rsync.


> Basically, AFAIK rsync makes no attempt to figure out file movement or 
> duplication between directories in order to "optimise" space used on the 
> target.  In particular, it won't try to be smarter than you: you made a copy 
> of the file, so as far as rsync is concerned, these are 2 different files in 
> 2 different directories 

OK, point taken.

> (if rsync tried to compare all your files amongst 
> themselves to find duplicates and hardlink them on the target, it would run 
> very slowly indeed I think).

Yes, I would agree.

>   I would expect it to work if you hardlink the 
> files (since the inode will be identical on the source) instead of copying 
> them, but I haven't tested this.

I will.

Is there any switch to tell dirvish/rsync to look for "duplicates" to
save space? Not that I would need it, but if it would exist I could
just decide for space or time...

`However, let us assume that you have invited me warmly into your
house. It is unwise to linger overlong on doorsteps in these troubled
(Albus Dumbledore in Harry Potter and the Half-Blood Prince)

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