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   iostat    ( 1 )

сообщать статистику центрального процессора (ЦП) и статистику ввода / вывода для устройств и разделов (Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.)
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Ошибки (баги) (Bugs)

/proc filesystem must be mounted for iostat to work.

Kernels older than 2.6.x are no longer supported.

Although iostat speaks of kilobytes (kB), megabytes (MB)..., it actually uses kibibytes (kiB), mebibytes (MiB)... A kibibyte is equal to 1024 bytes, and a mebibyte is equal to 1024 kibibytes.