iostat

avgrq-sz - средний размер запроса на ввод-вывод (в секторах)

avgqu-sz – средняя очередь запросов на операции ввода-вывода (в штуках)

await The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them – среднее время обработки запроса (включая время ожидания, в мс)

svctm – среднее время обработки запроса на ввод-вывод устройством (в миллисекундах)

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