109 lines
3.1 KiB
Groff
109 lines
3.1 KiB
Groff
.\"
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.\" Copyright (c) 2012-2016 Intel Corporation
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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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.\" without modification.
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.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer
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.\" substantially similar to the "NO WARRANTY" disclaimer below
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.\" ("Disclaimer") and any redistribution must be conditioned upon
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.\" including a substantially similar Disclaimer requirement for further
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.\" binary redistribution.
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.\"
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.\" NO WARRANTY
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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.\" HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGES.
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.\"
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.\" nvd driver man page.
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.\"
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.\" Author: Jim Harris <jimharris@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 18, 2019
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.Dt NVD 4
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.Os
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.Sh NAME
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.Nm nvd
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.Nd NVM Express disk driver
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.Sh SYNOPSIS
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To compile this driver into your kernel,
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place the following lines in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device nvme"
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.Cd "device nvd"
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.Ed
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.Pp
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Or, to load the driver as a module at boot, place the following lines in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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nvme_load="YES"
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nvd_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver exposes NVM Express (NVMe) namespaces as disks to the kernel disk
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storage API.
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It depends on the
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.Xr nvme 4
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driver for notification of existing NVMe namespaces and submission of NVM
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I/O commands.
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.Pp
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Device nodes from the
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.Nm
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driver will have the format /dev/nvdX and are
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.Xr GEOM 4
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disks which can be partitioned by
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.Xr geom 8 .
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Note that device nodes from the
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.Xr nvme 4
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driver are not
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.Xr GEOM 4
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disks and cannot be partitioned.
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.Sh CONFIGURATION
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The
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.Nm
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driver defines a system-wide maximum delete size for NVMe devices.
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The default is 1GB.
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To select a different value, set the following tunable in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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hw.nvd.delete_max=<delete size in bytes>
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.Ed
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.Sh SEE ALSO
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.Xr GEOM 4 ,
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.Xr nda 4 ,
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.Xr nvme 4 ,
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.Xr geom 8 ,
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.Xr nvmecontrol 8 ,
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.Xr disk 9
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 9.2 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was developed by Intel and originally written by
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.An Jim Harris Aq Mt jimharris@FreeBSD.org ,
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with contributions from Joe Golio at EMC.
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.Pp
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This man page was written by
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.An Jim Harris Aq Mt jimharris@FreeBSD.org .
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