Edward Ned Harvey <sola...@nedharvey.com> wrote:
> > Star implements this in a very effective way (by using libfind) that is
> > even
> > faster that the find(1) implementation from Sun.
>
> Even if I just "find" my filesystem, it will run for 7 hours. But zfs can
> create my whole incremental snapshot in a minute or two. There is no way
> star or any other user-space utility that walks the filesystem can come
> remotely close to this performance. Such performance can only be
> implemented at the filesystem level, or lower.
You claim that it is fast for you but this is because it is block oriented and
because you probably changed only few data.
If you like to have a backup that allows to access files, you need a file based
backup and I am sure that even a filesystem level scan for recently changed
files will not be much faster than what you may achive with e.g. star.
Note that ufsdump directly accesees the raw disk device and thus _is_ at
filesystem leven but still is slower than star on UFS.
Jörg
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