I have a web site with users lighttpd and CGI scripts.
After upgrading to Fedora 11 (ext4) the disc access became erratic.
The timing of python -c 'import cgi' varies between 0.1 to almost 10 seconds:
How can I diagnose the problem? (Tools, methods, best practices ...)
Update Jul 30, 2009:
Found out that several CGI process were hogging the drive. After killing them the graph is stable between 0.02 and 0.03. Still didn't get an answer on how to diagnose such problems.