Thanks. I would like to give the patches a try.
I've removed all of the redhat patches except for the one that tells dovecot where to find the certs (why does redhat use pki? why?) but I haven't installed this version yet. Are there any build/configure twiddles that might help?
Just as an update, I tried 1.1.3 with the nfs settings below. At first, it was horrid. Then I deleted the old index cache files. Now it seems to be working well (with webmail - major service is not yet moved). The load is under 1.
I've managed to descend into the twilight zone yet again. Just rolling one server and just rolling webmail for now - we'll see where it goes.
---Jack
Timo Sirainen wrote:
On Wed, 2008-09-10 at 12:20 -0700, Jack Stewart wrote:
The performance hit was bad. When I tried "mail_nfs_index = yes" the load went from 0.5 to 120+ (on each of three servers).
It shouldn't have been anything that bad. I could send you some patches that reduce what mail_nfs_index=yes does. It would be interesting to know if the problem is just one or few specific calls or all of them cumulatively.
dotlock_use_excl: no
"yes" should be safe (and faster) here.
-- Jack Stewart jstewart@caltech.edu / 626-395-4690 http://www.imss.caltech.edu