[CentOS] recommendations for copying large filesystems

>
> I have done 700k and 800k files transfers (including hardlinks), but 
> indeed it could take a while to compute the transferlist. Newer rsync 
> versions bring down the amount of memory needed drastically. That is 
> one of the reasons I offer a recent rsync in RPMforge. There is almost 
> never a good reason to use a dated rsync.
>
i have used rsync on ~16million files with a filesystem size of about 
1.5TB - worked fine but took a while