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

[Patrick Boutilier]

Vincent Fox wrote:
> 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!

We have used 3ware cards as well but are now switching to Highpoint RAID 
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.
> 
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