1.\" 2.\" Copyright (c) 2003 Poul-Henning Kamp 3.\" Copyright (c) 2017 Alexander Motin <mav@FreeBSD.org> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. The names of the authors may not be used to endorse or promote 15.\" products derived from this software without specific prior written 16.\" permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd March 5, 2024 31.Dt DISKINFO 8 32.Os 33.Sh NAME 34.Nm diskinfo 35.Nd get information about disk device 36.Sh SYNOPSIS 37.Nm 38.Op Fl citSvw 39.Ar disk ... 40.Nm 41.Op Fl l 42.Fl p 43.Ar disk ... 44.Nm 45.Op Fl l 46.Fl s 47.Ar disk ... 48.Sh DESCRIPTION 49The 50.Nm 51utility prints out information about a disk device, 52and optionally runs a naive performance test on the device. 53.Pp 54The following options are available: 55.Bl -tag -width ".Fl v" 56.It Fl v 57Print fields one per line with a descriptive comment. 58.It Fl c 59Perform a simple measurement of the I/O read command overhead. 60.It Fl i 61Perform a simple IOPS benchmark. 62.It Fl l 63In case of 64.Fl p 65or 66.Fl s 67modes prepend each line of an output with a device name using a tab 68character as a separator. 69.It Fl p 70Return the physical path of the disk. 71This is a string that identifies the physical path to the disk in the 72storage enclosure. 73.It Fl s 74Return the disk ident, usually the serial number. 75.It Fl S 76Perform synchronous random write test (ZFS SLOG test), 77measuring time required to write data blocks of different size and 78flush disk cache. 79Blocks of more then 128KB are written with multiple parallel operations. 80.It Fl t 81Perform a simple and rather naive benchmark of the disks seek 82and transfer performance. 83.It Fl w 84Allow disruptive write tests. 85.El 86.Pp 87If given no arguments, the output will be a single line per specified device 88with the following fields: device name, sectorsize, media size in bytes, 89media size in sectors, stripe size, stripe offset, firmware cylinders, 90firmware heads, and firmware sectors. 91The last three fields are only present if the information is available. 92.Sh EXAMPLES 93List first ten (at most) 94.Xr da 4 95devices with corresponding serial numbers: 96.Pp 97.Dl diskinfo -ls /dev/da? 98.Sh SEE ALSO 99.Xr da 4 100.Sh HISTORY 101The 102.Nm 103command appeared in 104.Fx 5.1 . 105.Sh AUTHORS 106The 107.Nm 108utility was written by 109.An Poul-Henning Kamp Aq Mt phk@FreeBSD.org . 110.Sh BUGS 111There are in order of increasing severity: lies, 112damn lies, statistics, and computer benchmarks. 113