prstat-a similar to ps in linux This gives overall cpu and memory utiliztion
vmstat -S 1 100 - it gives 100 reports with 1 sec interval for complete stats
iostat -xnm - x means extended statitics , n means show device paths, m means mount parition
main thigns to obeserve for io stat - %svc_time and %b
svc_time - above 30 milli seconds in a bottle neck
%b - if it is more than 20% the disk is busy
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