On Wed, 2003-11-26 at 21:30, Alejandro Leyva Rabinovich wrote: > i know that the message "I/O RATE LIMIT EXCEEDED: INFRAC01 643 SEC" > reffers to a treshold that rtm have, but, does it have any relationship > with cp? does z/vm do something when a user exceed the i/o rate limit?
No, the observation that RTM makes does not go back to CP. It is only meant to alert (automated) operators who call you in the middle of the night about this (or about storage utilization > 100% ...) Other than that there is no reason to adjust the threshold. You could however set a throttle on the device to make CP limit your I/O rate on the device if you wish. PS I guess the rate of 600 I/O's per second is pretty high and I would expect very small channel programs. With the lazy write in Linux one would expect filling a database to result in long channel programs writing a lot of blocks at once. Maybe you already saturated memory and bdflushd is running constantly. Rob
