iostat
TLDR
Display CPU and disk statistics
$ iostat
Display with megabytes units$ iostat -m
Display CPU statistics only$ iostat -c
Display disk statistics with names$ iostat -N
Display extended disk statistics$ iostat -xN sda
Display reports every 2 seconds$ iostat 2
Display 5 reports at 2-second intervals$ iostat 2 5
SYNOPSIS
iostat [options] [device...] [interval [count]]
DESCRIPTION
iostat monitors system input/output device loading by observing the time devices are active in relation to their average transfer rates. It generates CPU and device utilization reports useful for optimizing I/O performance.
PARAMETERS
-c
Display CPU utilization only-d
Display device utilization only-x
Display extended statistics-k
Display statistics in kilobytes per second-m
Display statistics in megabytes per second-N
Display registered device mapper names (LVM)-p [device|ALL]
Display statistics for block devices and partitions-t
Print timestamp for each report-y
Omit first report (boot statistics)-z
Exclude inactive devices from report-g GROUP
Display statistics grouped together-H
With -g, only show group totals-j {ID|LABEL|PATH|UUID}
Display persistent device names-o JSON
Output in JSON format--human
Print sizes in human-readable format--pretty
Pretty-print device names
CAVEATS
The first report shows statistics since boot. For current activity, use the -y option or ignore the first report. Extended statistics (-x) provide more detailed I/O metrics.
HISTORY
iostat is part of the sysstat package, providing system performance monitoring tools for Linux.
