>>>I understand that there is no way for anybody to project estimates for
code they didn't write. I was looking for more general info about clustering
databases as well as real numbers on existing CF apps that you folks may
have written.
Well I don't keep track of our numbers, but you can get them on the
Autobytel.com web site.
I can tell you that we use a fibre channel drive array that our two
clustered NT SQL 7.x servers both use. We also use Cisco's Local Director
for our web farm. We're looking into the LD/ClusterCats integration but
have not implemented it yet.
You say 3 million sessions. Do you mean 3 million DIFFERENT users at a
single time or are you interpreting sessions differently? Is it possible?
Sure it's possible. Will your application do it? My guess is not without
planning for this in the design phase. Most applications don't scale for
this size without planning. It sounds like you are on the right track
though. A few suggestions.
1. Use Akamai or Digital Island for ALL static content. Don't build a web
farm to handle this. Just have a farm to do dynamic page content (CFML).
2. Consider a multi-tier architecture or at least design your system to be
easily split into multiple tiers when you have time/resources to do this.
3. Redundancy... with this type of volume, you had better make sure you have
extremely well planned redundancy with automatic "switches" so that whenever
an application, server, network component, etc. fails, something is
automatically re-routed (i.e. no human intervention). At that load level, a
human just can't react in time. Even a simple reboot of a component means
it's going to be slammed the moment it's brought back online. Have a method
for phasing it in.
4. Optimize the code... this is a huge step, but review and re-review the
code to make sure it's as tuned as possible, using caching methods, stored
procedures instead of dynamic code, etc. where possible.
As for URLs to visit, I'm in the process of building a site with all of my
notes in it. I still need to do more data entry to get the mini-articles
all up there before I can post it. In the meantime you can look at a
PowerPoint presentation I did at http://www.sccfug.org to get started.
Do me a favor and let me know what you decide. I'm always interested in
hearing other people's environments and design issues so I can take those
notes and publish them. I'll keep your name confidential if you want.
GOOD LUCK!
--Doug
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