DISKINFO(8) FreeBSD System Manager's Manual DISKINFO(8)
NAME
diskinfo - get information about disk device
SYNOPSIS
diskinfo [-citSvw] disk ...
diskinfo [-l] -p disk ...
diskinfo [-l] -s disk ...
DESCRIPTION
The diskinfo utility prints out information about a disk device, and
optionally 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.
-l
In case of -p or -s modes prepend each line of an output with a device
name using a tab character as a separator.
-p
Return the physical path of the disk. This is a string that
identifies 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
operations.
-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
device with the following fields: device name, sectorsize, media size in
bytes, media size in sectors, stripe size, stripe offset, firmware
cylinders, firmware heads, and firmware sectors. The last three fields
are only present if the information is available.
EXAMPLES
List first ten (at most) da(4) devices with corresponding serial numbers:
diskinfo -ls /dev/da?
SEE ALSO
da(4)
HISTORY
The diskinfo command appeared in FreeBSD 5.1.
AUTHORS
The diskinfo utility was written by Poul-Henning Kamp <
[email protected]>.
BUGS
There are in order of increasing severity: lies, damn lies, statistics,
and computer benchmarks.
FreeBSD 14.1-RELEASE-p8 March 5, 2024 FreeBSD 14.1-RELEASE-p8