I have some Game Server services running on my Debian 6.0 64-bit Custom Kernel machine.
I lag on my currently running services whenever I install a new service.
Installing a new service just involves extracting the files to a user's directory although I do it at the lowest priority ( nice 19 and 1000kbps SCP limit ).
This time I took a "vmstat 3" output during the time I was installing new service and when the lag occurred. I'm not good at reading it good though but I guess these are some disk issues.
See line numbers 11-16 for the time when it happened.
And the 250G disk is the one in use with those operations and services.