NAME
nda —
NVMe Direct Access device
driver
SYNOPSIS
device nvme
device scbus
DESCRIPTION
Thenda 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
ndadriver accepts unmapped I/O for this unit.
FILES
- /dev/nda*
- NVMe storage device nodes
SEE ALSO
HISTORY
The nda driver first appeared in
FreeBSD 12.0.
AUTHORS
Warner Losh <imp@FreeBSD.org>