Just for reference, I have Mac Pro (quad 2.66 xeon, 5gb RAM, Mac OS X Server 10.4.11, Zimbra 5.0.1 NE [just came from OSE 5 days ago]), with 2 mirrored 160GB SATA drives for the OS and Zimbra executables, and 2 mirrored 400GB SATAs for the mailstores and indexes (so, not a hardware RAID, and certainly no RAID5). 35 accounts, about half of which use IMAP (outlook, apple mail), the other half ZWC, with a mailstore of 40GB (and growing pretty quick). The machine used to only have 2GB RAM, and even then, at the peak of the day, that server hardly showed a *dent* in processor usage. Users report a very responsive experience. In contrast, I have another 35 users on another server using the Mac OS X Server cyrus-based mail server, and that thing fluctuates from 30-80% usage on both cores all throughout the day.
Originally Posted by mikelcu
One thing I've noticed, though, is that performing a large operation with an account does seize things up a bit... but only for that account. While doing migrations, I was actually having a few users access their accounts while their old mailstores were being migrated via imapsync on another machine, and while other people noticed nothing unusual/no slowdowns, the user who's mail was being imported certainly noticed, and a single core (just one) on the machine would shoot up to 97-99% usage. Again, though, this did not affect performance for anything *but that account.*
mark daniel | actc
zcs 6 ose | mac pro | mac os x server 10.4.11