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.\" $FreeBSD$ 31.\" 32.Dd July 4, 2017 33.Dt DISKINFO 8 34.Os 35.Sh NAME 36.Nm diskinfo 37.Nd get information about disk device 38.Sh SYNOPSIS 39.Nm 40.Op Fl citSvw 41.Ar disk ... 42.Nm 43.Op Fl p 44.Ar disk ... 45.Nm 46.Op 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 p 63Return the physical path of the disk. 64This is a string that identifies the physical path to the disk in the 65storage enclosure. 66.It Fl s 67Return the disk ident, usually the serial number. 68.It Fl S 69Perform synchronous random write test (ZFS SLOG test), 70measuring time required to write data blocks of different size and 71flush disk cache. 72Blocks of more then 128KB are written with multiple parallel operations. 73.It Fl t 74Perform a simple and rather naive benchmark of the disks seek 75and transfer performance. 76.It Fl w 77Allow disruptive write tests. 78.El 79.Pp 80If given no arguments, the output will be a single line per specified device 81with the following fields: device name, sectorsize, media size in bytes, 82media size in sectors, stripe size, stripe offset, firmware cylinders, 83firmware heads, and firmware sectors. 84The last three fields are only present if the information is available. 85.Sh HISTORY 86The 87.Nm 88command appeared in 89.Fx 5.1 . 90.Sh AUTHORS 91The 92.Nm 93utility was written by 94.An Poul-Henning Kamp Aq Mt phk@FreeBSD.org . 95.Sh BUGS 96There are in order of increasing severity: lies, 97damn lies, statistics, and computer benchmarks. 98