NFS issues since upgrading to 13-RELEASE

Olav Gjerde olav at
Thu Apr 15 19:07:33 UTC 2021

I have the same issue, using Ubuntu 20.10 with Linux 5.8 kernel. The Linux
NFS client will get unresponsive and it does not recover in my case, even
if I restart NFS on FreeBSD. I upgraded from FreeBSD 12.1-RELEASE though.

On Thu, Apr 15, 2021 at 8:36 PM Allan Jude <allanjude at> wrote:

> On 4/15/2021 9:22 AM, Chris Roose wrote:
> > I posted this in -questions and someone suggested I post here as well.
> >
> > I'm having NFS availability issues between my Proxmox client and FreeBSD
> server (10G link) since upgrading to 13-RELEASE. And unfortunately I
> upgraded my ZFS pool to v2.0.0 before I noticed the issue, so I'm kind of
> stuck.
> >
> > Periodically, the NFS server (I've tried both v3 and v4.2 clients) will
> go unresponsive for several minutes. I never had this problem on 12.2, and
> as far as I can tell it's not a disk or network I/O issue. I'll get several
> "nfs: server not responding, still trying" messages on the client and a few
> minutes later it usually recovers. It's not clear to me yet what's causing
> the block. Restarting nfsd on the server will resolve the issue if it
> doesn't clear itself.
> >
> > Any pointers for troubleshooting this? I've been looking through vmstat,
> gstat, top, etc. when the problem occurs, but I haven't been able to
> pinpoint the issue. I can get pcap, but it would be from the hosts, because
> I don't have a 10G tap or managed switch.
> >
> run `nfsstat -d 1` and try to capture a few lines from before, during,
> and after the stall, and that may provide some insight.
> Specifically, does the queue length grow, suggesting it is waiting on
> the I/O subsystem, or does it just stop getting traffic all together.
> --
> Allan Jude
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Kind Regards / Med Vennlig Hilsen

Olav Grønås Gjerde

BackupBay Gjerde
Madlaforen 35
Phone: +47 918 000 59

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