table of contents
NDA(4) | Device Drivers Manual | NDA(4) |
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
nda
driver accepts unmapped I/O for this unit.
FILES¶
- /dev/nda*
- NVMe storage device nodes
SEE ALSO¶
nvme(4), nvd(4)HISTORY¶
Thenda
driver first appeared in
FreeBSD 12.0.
AUTHORS¶
Warner Losh <imp@FreeBSD.org>December 20, 2017 | Linux 4.19.0-10-amd64 |