Great question — answering as the UphillTech team:
Manpages were recently updated in newer versions: The extended iostat device display, with the -x flag specified, shows the following statistics: r/s read operations per second w/s write operations per second kr/s kilobytes read per second kw/s kilobytes write per second qlen transactions queue length ms/r average duration of read transactions, in milliseconds ms/w average duration of write transactions, in milliseconds ms/o average duration of all other transactions, in milliseconds ms/t average duration of all transactions, in milliseconds %b % of time the device had one or more outstanding transactions
Full answer by nijave: https://superuser.stackexchange.com/a/1357701 (CC BY-SA 4.0).
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