> At peak times the server comes to a crawl, so much so
> that mail connections time out etc.
I'm also seeing major slowdowns and am looking into a solution. Our
current setup is a little different:
Xserve G5 2GHz, 5GB RAM, 10.4.10
Mail volume on local dedicated disk (80GB SATA; 59GB used)
5K Active Directory users (slows down at 30+ concurrent users)
No AV/AS filtering on server (handled at the gateway)
No shared folders
Using skiplist
I've tried some php and apache optimizations as posted in their
respective performance notes--didn't help us much probably because
disk I/O is the hangup. Looking at cyrus' performance notes, but
don't have the disks to dedicate to cyrus meta storage nor can I move
/var/imap/proc to a tmpfs type because OS X doesn't support tmpfs.
If/when Leopard supports read/write zfs that may help the mail store
performance.
I'm currently trying to build imapproxy (free, open source, but site
imapproxy.org has been down lately). This is supposed to cache IMAP
connections. Some are seeing 70% fewer imapd processes. I'm just no
pro at debugging build errors. :>)
FWIW, there is an interesting thread going on now in the info-cyrus
mailing list called "LARGE single-system Cyrus installs?" (>70 posts)
which notes some performance tips from the field, but I don't think
any of them are using OS X; most run Solaris.
http://www.mail-archive.com/email@hidden/msg33661.html
~ Wayne
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