iostat is a very handy tool to help you investigating what kind of performance problems you have. Especially your databases can cause a lot of troubles to your I/O system and thus it would be very nice if every DBA has installed iostat on all of his MySQL database servers.
Unfortunately most of the Linux distributions do NOT install iostat by default. This causes often unfortunate situations when you are in a MySQL consulting engagement or have a MySQL support case and ask the customer for the output of …
