On Wed, 27 Feb 2013, Ian Collins wrote:
I am finding that rsync with the right options (to directly
block-overwrite) plus zfs snapshots is providing me with pretty
amazing "deduplication" for backups without even enabling
deduplication in zfs. Now backup storage goes a very long way.
We do the same for all of our "legacy" operating system backups. Take a
snapshot then do an rsync and an excellent way of maintaining incremental
backups for those.
Magic rsync options used:
-a --inplace --no-whole-file --delete-excluded
This causes rsync to overwrite the file blocks in place rather than
writing to a new temporary file first. As a result, zfs COW produces
primitive "deduplication" of at least the unchanged blocks (by writing
nothing) while writing new COW blocks for the changed blocks.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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