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I want to monitor hard disk busy time (as a percentage) to find out when the disk is causing a bottleneck in my workflow. On linux / BSD this can be done with iostat -x to see extended statistics including %util. But the -x option is missing in macOS implementation of iostat. Is there any other tool that can get this information?

Example output from CentOS:

$ iostat -dx sdb -c 1
Linux 4.18.0-348.7.1.el8_5.x86_64 (localhost.localdomain)   04/11/2022  _x86_64_    (64 CPU)

Device            r/s     w/s     rkB/s     wkB/s   rrqm/s   wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util
sdb              0.00  494.00      0.00 505856.00     0.00     0.00   0.00   0.00    0.00   12.46   6.16     0.00  1024.00   2.02 100.00

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