# from Marco Jackel
# on Thursday 21 June 2007 01:43 am:
>what happen if I move or rename files or folders in a directory that
>gets backuped every night. Are those "new" files/folders hardlinked to
>the existing ones in the backup, too?
No. The backup linkage is by-name only.
There are backup systems that do checksum-based pooling[1], which allows
sharing the space used for identical files even if they came from
multiple source machines, but dirvish is not one of those.
[1] The files are stored in a single repository named by an md5sum
fingerprint of their contents and trees are replicated by hardlinking
the names to the content files. This saves space at the expense of
cpu/disk load depending on your situation. Some schemes might use
size/dates as a first-check to avoid recreating checksums iff the files
did not get renamed. Similarly, multiple same-distro source machines
might be able to avoid transferring files such as /usr/lib/libc.so but
they'll still have to initially do the checksum somewhere.
--Eric
--
"It ain't those parts of the Bible that I can't understand that
bother me, it's the parts that I do understand."
--Mark Twain
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