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DISKINFO(8)		FreeBSD	System Manager's Manual		   DISKINFO(8)

     diskinfo -- get information about disk device

     diskinfo [-citSvw]	disk ...
     diskinfo [-p] disk	...
     diskinfo [-s] disk	...

     The diskinfo utility prints out information about a disk device, and op-
     tionally runs a naive performance test on the device.

     The following options are available:

     -v	 Print fields one per line with	a descriptive comment.

     -c	 Perform a simple measurement of the I/O read command overhead.

     -i	 Perform a simple IOPS benchmark.

     -p	 Return	the physical path of the disk.	This is	a string that identi-
	 fies the physical path	to the disk in the storage enclosure.

     -s	 Return	the disk ident,	usually	the serial number.

     -S	 Perform synchronous random write test (ZFS SLOG test),	measuring time
	 required to write data	blocks of different size and flush disk	cache.
	 Blocks	of more	then 128KB are written with multiple parallel opera-

     -t	 Perform a simple and rather naive benchmark of	the disks seek and
	 transfer performance.

     -w	 Allow disruptive write	tests.

     If	given no arguments, the	output will be a single	line per specified de-
     vice with the following fields: device name, sectorsize, media size in
     bytes, media size in sectors, stripe size,	stripe offset, firmware	cylin-
     ders, firmware heads, and firmware	sectors.  The last three fields	are
     only present if the information is	available.

     The diskinfo command appeared in FreeBSD 5.1.

     The diskinfo utility was written by Poul-Henning Kamp <>.

     There are in order	of increasing severity:	lies, damn lies, statistics,
     and computer benchmarks.

FreeBSD	13.0			 July 4, 2017			  FreeBSD 13.0


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