NAME

nda — NVMe Direct Access device driver

SYNOPSIS

device nvme
device scbus

DESCRIPTION

The nda driver provides support for direct access devices, implementing the NVMe command protocol, that are attached to the system through a host adapter supported by the CAM subsystem.

SYSCTL VARIABLES

The following variables are available as both sysctl(8) variables and loader(8) tunables:

kern.cam.nda.sort_io_queue

This variable determines whether the software queued entries are sorted in LBA order or not. Sorting is almost always a waste of time. The default is to not sort.

The following report per-device settings, and are read-only unless otherwise indicated. Replace N with the device unit number.

kern.cam.nda.N.rotating

This variable reports whether the storage volume is spinning or flash. It's value is hard coded to 0 indicating flash.

kern.cam.nda.N.unmapped_io

This variable reports whether the nda driver accepts unmapped I/O for this unit.

FILES

/dev/nda*

NVMe storage device nodes

SEE ALSO

nvme(4), nvd(4)

HISTORY

The nda driver first appeared in FreeBSD 12.0.

AUTHORS

Warner Losh <imp@FreeBSD.org>