Re: BHYVE on NFSv4.2 filesystem?

On Mon, 18 May 2026 at 23:49, Rick Macklem <[email protected]> wrote:
>
> On Mon, May 18, 2026 at 2:27 PM Dan Shelton <[email protected]> wrote:
> >
> > On Fri, 20 Feb 2026 at 01:21, Bakul Shah <[email protected]> wrote:
> > >
> > > On Feb 19, 2026, at 11:45 AM, Dan Shelton <[email protected]> wrote:
> > > >
> > > > On Wed, 18 Feb 2026 at 22:45, Dan Shelton <[email protected]> wrote:
> > > >>
> > > >> Hello,
> > > >>
> > > >> Has anyone tried a BHYVE with a disk as file on a NFSv4.2 mount?
> > >
> > > Yes. [I tried this on a 15.0-RELEASE-p3 host, nfsv4.2 mounting
> > > a filesystem from a 15.0-STABLE machine]
> >
> > How about the performance? Is it better than iSCSI?
> >
> > >
> > > >
> > > > And does BHYVE disk emulation send a NFSv4.2 DEALLOCATE if the disk
> > > > gets a TRIM cmd?
> > >
> > > No idea.
> >
> > Which tool can be used to figure that out? dtrace on the FreeBSD
> > NFSv4.2 client? Rick?
> Ask google's ai.
>
> I just typed "does zfs use trim" and it gave me an answer
> that looks legit. Is it correct? I don't know, but if you don't
> think so, find a ZFS wizzard.
>
> ZFS is the only local fs that supports DEALLOCATE at this
> time, so it is up to ZFS.

No, the question is whether the BHYVE disk emulation uses deallocate()
to free blocks, and the FreeBSD NFSv4.2 client translates deallocate()
to NFSv4.2 DEALLOCATE

Dan
-- 
Dan Shelton - Cluster Specialist Win/Lin/Bsd