Just thought I would add to this post. In another life, and some time ago, I explored Ramdisks
in various configurations. In my results the bottom line was that it was the fastest method
for disk IO bound applications, _as long as there is sufficient CPU bandwidth available_. In
other words, the problem just spread elsewhere as now the CPU had to actually move memory
around and could not make use of any DMA devices (directly).
The _absolute_ best method for a RAM disk is an external device, that connects via Fibre or SCSI
hi-bandwidth. This way, all of the I/Os can happen within the original Disk I/O subsystem. You
end up with basically zero latency, and the I/O can happen via DMA access, while the CPU is
doing other things. Downside was $$$$.
If you google for "Solid state ram disk" you can find various products. An example is:
http://www.superssd.com/products/ramsan-320/index.htm Please note that I HAVE NO INTEREST IN THIS COMPANY. I JUST GOOGLED... But they do claim 250,000 I/Os per second, with 3 GB/Sec of thruput. That is a lot of email...
My $0.02, Steve
At 07:34 AM 4/1/2004, Phillip Beazley wrote:
At 10:22 AM 4/1/2004, you wrote:
>I installed and tested the RAMDisk mentioned in an earlier thread with >disappointing results. I configured the RAMDisk to hold the POST spool >directory. While I did see a slight performance increase for creating files >with CFX_iMSMail, the net improvement in my overall sending speed was >marginal. Also, after sending about 1 million emails my server locked-up >with some odd memory related errors in the event log. I have removed the >RAMDisk from my server. > >I have tried several approaches now to increase the rate at which iMS POST >will send emails. No matter what I try, it seems like 23K-24K per hour is >the limit. We would like to double this rate to around 50K/hour. Has anyone >achieved this speed from a single server? If so, how? Note that we send >unique emails that average about 15KB in size. We have no bandwidth >restrictions. We have the full enterprise version (1024 threads).
Were you logging to RAM as well? I don't have any specific thoughts on this, I'm presumably entering this late and you've addressed any other server-related performance issues.
-- Phillip Beazley Onvix -- Website Hosting, Development & E-commerce Visit http://www.onvix.com/ or call 727-578-9600.
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