Disk

Drupal Performance and Scalability With Excessive I/O Load Or Memory Exhausion

On many occasions, we see web site performance suffereing due to misconfiguration or oversight of system resources. Here is an example where RAM and Disk I/O severely impacted web site performance, and how we fixed them.

A recent project for a client who had bad site performance uncovered issues within the application itself, i.e. how the Drupal site was put together. However, overcoming those issues was not enough to achieve the required scalability with several hundred logged in users on the site at the same time.

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Reducing the size and I/O load of Apache's web server log files

Apache, and all other web servers, have a mechanism to write an "access log" recording every HTTP access to the server. The information that is logged is valuable, and includes things like the IP address of the user making the request, the date and time, the size of the request in bytes, the return code from the HTTP protocol, the request's URI, the referer, and the browser/operating system that the user is using.

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