To make your application "horizontally scalable", don't do anything to keep it from being so. Don't use shared memory. Don't use the local filesystem. Put stuff in the database.

Voila! You can now run one database and many webservers. As long as the database doesn't fall over, you scale.

In reply to Re^4: How to recommend hardware to customers? by tilly
in thread How to recommend hardware to customers? by amonroy

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