when to use "/dev/nvme0ns1"

Warner Losh imp at bsdimp.com
Sun Dec 6 05:43:03 UTC 2020

On Sat, Dec 5, 2020 at 10:36 PM Yuri Pankov <yuripv at yuripv.dev> wrote:

> Krishnamraju Eraparaju wrote:
> > Hi All,
> >
> >
> > I see there are two ways of accessing NVMe disk:
> >     1)GEOM based: /dev/nvd0 or /dev/nda0
> >     2)/dev/nvme0ns1
> >
> > When should one use " /dev/nvme0ns1"?
> See nvmecontrol(8) for the commands that operate on namespace ids.  And
> while you could still use nvd/nda devices for those, specifying the
> namespace explicitly could be helpful.
> An excerpt from man page:
>       Where ⟨namespace-id⟩ is required, you can use either the nvmeXnsY
>       device, or the disk device such as ndaZ or nvdZ.  The leading /dev/
>       is omitted.

Yes. nvd* and nda* are block devices. nvme0ns1 is for administrative things
when you may or may not have an nda/nvd device hanging around, or you want
to deal with a specific thing and don't know the mapping to the nda/nvd


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