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>