Miserable performance of cyrus-imapd 2.3.9 -- seems to be lockingissues

[Vincent Fox]

Jeff Fookson wrote:
> We are planning to run the mirrors
> off a 4-port 3ware RAID card even though we're not overly fond of 
> 3ware (we have a fair amount of experience
> with RAID5 arrays on 3ware cards on our research  machines where they 
> perform adequately but
> not more). We are hoping the 3ware RAID1 will be a bit better than 
> software RAID1.

I used to use those, awesome little cards!

> Can someone in fact suggest a good battery of testing software so that 
> we don't prematurely certify that a new system
> is ready for production use (or a useful statistic to monitor)?

This has been a sticky issue for UC Davis.  Run filebench test "varmail" 
to prove disk subsystem.
The SLAMd stuff seems to work for simulating client load, but all 
attempts to simulate
a client load-pattern are devilishly difficult to get right.