Hello,I'm not a Cyrus expert, but to my knowledge high %sys loads point to CPU time spent in kernel space for doing things. One common reason could be slow/overloaded I/O but this would be noticed at the %wait at least as long as there is progress with I/O at all. So from my point of view you either have a hardware problem where the kernel is doing "busy wait" for things it should not have to wait, or you hit a kernel bug somewhere. This would also be in line with your observation that the system is non-responsive at all, while the number of processes, the mempry usage and the %user is at normal or lower than expected.
Do you have any events in the kernel/system log or at the console at the time problem starts?
Regards Andreas
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