"iostat -x" now shows these (ala linux/solaris), but this is only splitting
the read/write bytes/transactions, not adding any new metrics. "systat
iostat" now has two new commands to switch between combined/separate mode
for both it's numbers & bar modes.
cpus and hz is measured in ticks per cpu, divide tick count by ncpu to
determine elapsed time since last sample.
Fixes I/O rate deflation observed on multiprocessors.
