Hi Kjetil, Unfortunately, dedup will only apply to data written after the setting is enabled. That also means that new blocks cannot dedup against old block regardless of how they were written. There is therefore no way to "prepare" your pool for dedup -- you just have to enable it when you have the new bits.
Adam On Dec 9, 2009, at 3:40 AM, Kjetil Torgrim Homme wrote: > I'm planning to try out deduplication in the near future, but started > wondering if I can prepare for it on my servers. one thing which struck > me was that I should change the checksum algorithm to sha256 as soon as > possible. but I wonder -- is that sufficient? will the dedup code know > about old blocks when I store new data? > > let's say I have an existing file img0.jpg. I turn on dedup, and copy > it twice, to img0a.jpg and img0b.jpg. will all three files refer to the > same block(s), or will only img0a and img0b share blocks? > > -- > Kjetil T. Homme > Redpill Linpro AS - Changing the game > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Adam Leventhal, Fishworks http://blogs.sun.com/ahl _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
