22 Jan
2010
22 Jan
'10
11:12 p.m.
On Fri, 2010-01-22 at 16:09 -0500, Frank Cusack wrote:
On January 22, 2010 11:05:22 PM +0200 Timo Sirainen tss@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.