On Wed, Mar 17, 2010 at 3:12 PM, Mark Moseley <moseleym...@gmail.com> wrote: > On Wed, Mar 17, 2010 at 1:09 PM, Timo Sirainen <t...@iki.fi> wrote: <snip> >> I don't know if anyone has run local indexes in larger setups, so I >> can't really give any good answers. The worst case of rebuilding the >> whole index isn't anyway any worse than what Courier has to do every >> time. > > I'll check it out. And if we go that route and I'm still sane at the > end, I'll be sure to report back :)
Update on this one point: We've been running local indexes for a while now and it's worked wonderfully. The load balancers in front of 2 groups of 30 IMAP servers are doing a sticky-source persistence of a day. Our NFS reads/sec dropped by literally 8x by moving to Dovecot, even with the local indexes--looking at the graphs, it's a seriously jaw-dropping plummet. I've not heard a single complaint of corruption. Next step is to get the indexes on SSDs just to squeeze out a few extra jiffies. All in all, it's been remarkably successful (and almost bizarrely gotcha-free -- though I haven't tackled POP3 yet). Our formerly irate IMAP users are all sweetness and light now. Thanks Timo!
