On Fri, 2010-01-22 at 16:09 -0500, Frank Cusack wrote: > On January 22, 2010 11:05:22 PM +0200 Timo Sirainen <t...@iki.fi> wrote: > > Dunno about zfs, but I've heard that at least in one NetApp installation > > deduplication was way too heavyweight. > > zfs dedup is pretty resources intensive -- for writes. For mail I > suspect reads overwhelm writes?
I don't have any evidence, but my logic goes like: Mail is written to disk once. Most users use a single client, which downloads the message once. Or maybe they're using webmail, and they read the same message approximately once (or maybe max. 1.1 times). In both cases read:write is about 1:1. Index files are of course a different thing. They're read a lot more often. But dedup doesn't help with them.
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