On Sat, 9 Oct 2010, Richard Elling wrote:
On Oct 8, 2010, at 10:01 AM, Bob Friesenhahn wrote:
Regardless, nothing beats raidz3 based on computable statistics.
Well, no, not really. It all depends on the number of sets and the MTTR.
Well, ok. I should have appended "except for 3-way mirrors". :-)
3-way mirrors seem like an expensive solution for bulk data backup
except that it turns out that if the current data fits (with plenty of
headroom) on the 3-way mirror solution, zfs snapshots (with
compression enabled) are an excellent way to capture the incremental
changes over time. This requires care for how updates are applied to
the backup pool so that unchanged data blocks are not overwritten.
Usually backed up data does not change rapidly over time so the
incremental snapshots don't require much space.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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