[OmniOS-discuss] Win 8.1 NFS client

[Valrhona]

I have a very stable OmniOS machine (Dell T710, zpools are striped
mirrors of 2.5 SAS drives and 3-4 TB, DDRdrive ZIL and 72 GB of RAM,
so no L2ARC). I installed a new copy of r151010 a couple of months
ago, and in general have not had any problems at all. Until today.

My older machines run either OpenIndiana, Xubuntu 14.04 LTS, and Win
7. I share all of the zfs filesystems via NFS, and use Napp-It to
monitor status (as I tend to prefer the command line). In all cases,
the NFS drives were mounted to client computers with the "mount"
command (in either windows, Linux or Solaris). For windows, I used its
"mount" command, and have consistently had mediocre performance (30
MB/sec over gigabit, when both Linux and OpenSolaris can transfer data
at 110+ MB/sec.), and long latency, but otherwise it works.

Today I got a new laptop, which I installed Win 8.1 Enterprise on. The
NFS connection is MUCH faster, both in terms of perceived latency, and
transfer rates, which for large sequential transfer can hit 80-90
MB/sec (rates that are typical when I NFS mount in Linux or
OpenSolaris).

The problem is, after I use the NFS mount to my new machine, it
somehow causes OmniOS's NFS server to drop out, and say it's "offline"
in, for instance, Napp-It, and the zfs filesystems are then
inaccessible (though I can still look at the web status, and SSH into
the box, so it's not a general problem). As a result, t

Has anyone else ever seen this, where an NFS client can cause
"nfs-server" on the host to freeze? I can reboot the server, but that
is not a great solution, and would like to know what I can do to
figure this problem out better. Thank you all in advance!

Peter