On 2/4/10 8:00 AM +0100 Tomas Ögren wrote:
rsync by default compares metadata first, and only checks through every
byte if you add the -c (checksum) flag.
I would say rsync is the best tool here.
ah, i didn't know that was the default. no wonder recently when i was
incremental-rsyncing a few TB of data between 2 hosts (not using zfs)
i didn't get any speedup from --size-only or whatever the flag is.
The "find -newer blah" suggested in other posts won't catch newer files
with an old timestamp (which could happen for various reasons, like
being copied with kept timestamps from somewhere else).
good point. that is definitely a restriction with find -newer. but if
you meet that restriction, and don't need to find added or deleted files,
it will be faster since only 1 directory tree has to be walked.
but in the general case it does sound like rsync is the best. unless
bart can find added and missing files. in which case bart is better
because it only has to walk 1 dir tree -- assuming you have a saved
manifest from a previous walk over the original dir tree.
-frank
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