Greg Knaddison wrote:
As you said, it would be worthwhile to capture the output of top. I like to use
# date >> /tmp/topper.txt; top -b -n 1 >> /tmp/topper.txt
Also install 'sysstat' (comes prepackaged with all modern RedHat/CentOS), which is a rewrite of the venerable sa* tools from Solaris for linux - namely, 'sar', 'iostat', 'mpstat' and their collection agents. Reviewing historical sar output can find a lot of trends and help find the problem.
-te