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Man Pages


Manual Reference Pages  -  NVD (4)

NAME

nvd - NVM Express disk driver

CONTENTS

Synopsis
Description
Configuration
See Also
History
Authors

SYNOPSIS

To compile this driver into your kernel, place the following lines in your kernel configuration file:


.Cd device nvme
.Cd device nvd

Or, to load the driver as a module at boot, place the following lines in loader.conf(5):

nvme_load="YES"
nvd_load="YES"

DESCRIPTION

The nvd driver exposes NVM Express (NVMe) namespaces as disks to the kernel disk storage API. It depends on the nvme(4) driver for notification of existing NVMe namespaces and submission of NVM I/O commands.

Device nodes from the nvd driver will have the format /dev/nvdX and are GEOM(4) disks which can be partitioned by geom(8). Note that device nodes from the nvme(4) driver are not GEOM(4) disks and cannot be partitioned.

CONFIGURATION

The nvd driver defines a system-wide maximum delete size for NVMe devices. The default is 1GB. To select a different value, set the following tunable in loader.conf(5):
hw.nvd.delete_max=<delete size in bytes>

SEE ALSO

GEOM(4), nvme(4), geom(8), nvmecontrol(8), disk(9)

HISTORY

The nvd driver first appeared in
.Fx 9.2.

AUTHORS


.An -nosplit The nvd driver was developed by Intel and originally written by
.An Jim Harris Aq jimharris@FreeBSD.org , with contributions from Joe Golio at EMC.

This man page was written by
.An Jim Harris Aq jimharris@FreeBSD.org .

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