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.
If you have an IO bottleneck you'll have to solve that problem.
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.
No. If you have a IO bottleneck it's not going to magically help.
It's pretty basic. If you have so much disk IO that you're saturating
the system your only way around this is to split the load across
machines.
Consider a F5 BigIP or something similar and use a three tier
approach for the backend.
-dhan
------------------------------------------------------------------------
Dan Shoop
Computer Scientist
iWiring / U.S. Technical Services
For immediate response for urgent matters please speak to the Duty
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