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98 lines
3.2 KiB
Groff
98 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 2003 Poul-Henning Kamp
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.\" Copyright (c) 2017 Alexander Motin <mav@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The names of the authors may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 4, 2017
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.Dt DISKINFO 8
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.Os
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.Sh NAME
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.Nm diskinfo
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.Nd get information about disk device
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.Sh SYNOPSIS
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.Nm
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.Op Fl citSvw
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.Ar disk ...
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.Nm
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.Op Fl p
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.Ar disk ...
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.Nm
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.Op Fl s
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.Ar disk ...
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.Sh DESCRIPTION
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The
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.Nm
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utility prints out information about a disk device,
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and optionally runs a naive performance test on the device.
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.Pp
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The following options are available:
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.Bl -tag -width ".Fl v"
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.It Fl v
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Print fields one per line with a descriptive comment.
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.It Fl c
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Perform a simple measurement of the I/O read command overhead.
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.It Fl i
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Perform a simple IOPS benchmark.
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.It Fl p
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Return the physical path of the disk.
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This is a string that identifies the physical path to the disk in the
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storage enclosure.
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.It Fl s
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Return the disk ident, usually the serial number.
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.It Fl S
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Perform synchronous random write test (ZFS SLOG test),
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measuring time required to write data blocks of different size and
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flush disk cache.
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Blocks of more then 128KB are written with multiple parallel operations.
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.It Fl t
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Perform a simple and rather naive benchmark of the disks seek
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and transfer performance.
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.It Fl w
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Allow disruptive write tests.
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.El
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.Pp
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If given no arguments, the output will be a single line per specified device
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with the following fields: device name, sectorsize, media size in bytes,
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media size in sectors, stripe size, stripe offset, firmware cylinders,
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firmware heads, and firmware sectors.
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The last three fields are only present if the information is available.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Fx 5.1 .
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.Sh AUTHORS
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The
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.Nm
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utility was written by
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.An Poul-Henning Kamp Aq Mt phk@FreeBSD.org .
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.Sh BUGS
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There are in order of increasing severity: lies,
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damn lies, statistics, and computer benchmarks.
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