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nda(4)

NDA(4)                   BSD Kernel Interfaces Manual                   NDA(4)

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 other‐
     wise 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>

BSD                            December 20, 2017                           BSD
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