`<div dir="ltr"><div><div><div><div>You may have revealed the cause of a problem I've seen a few times, but have not made the correlation. In my case we have 100+ CentOS NFS clients and a periodic use of 2012R2 server connecting via NFS. <br>
<br></div>I have had a few drop offs of the NFS server with out a single line in the event logs, just complete non-responsiveness. <br><br></div>I will definitely be digging deeper into this. <br><br></div>This is most likely Illumos wide, not just OmniOS. I will report back to both lists if I can get anything reproducible. <br>
<br></div>-Chip<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 13, 2014 at 5:54 AM, Valrhona <span dir="ltr"><<a href="mailto:valrhona@gmail.com" target="_blank">valrhona@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have a very stable OmniOS machine (Dell T710, zpools are striped<br>
mirrors of 2.5 SAS drives and 3-4 TB, DDRdrive ZIL and 72 GB of RAM,<br>
so no L2ARC). I installed a new copy of r151010 a couple of months<br>
ago, and in general have not had any problems at all. Until today.<br>
<br>
My older machines run either OpenIndiana, Xubuntu 14.04 LTS, and Win<br>
7. I share all of the zfs filesystems via NFS, and use Napp-It to<br>
monitor status (as I tend to prefer the command line). In all cases,<br>
the NFS drives were mounted to client computers with the "mount"<br>
command (in either windows, Linux or Solaris). For windows, I used its<br>
"mount" command, and have consistently had mediocre performance (30<br>
MB/sec over gigabit, when both Linux and OpenSolaris can transfer data<br>
at 110+ MB/sec.), and long latency, but otherwise it works.<br>
<br>
Today I got a new laptop, which I installed Win 8.1 Enterprise on. The<br>
NFS connection is MUCH faster, both in terms of perceived latency, and<br>
transfer rates, which for large sequential transfer can hit 80-90<br>
MB/sec (rates that are typical when I NFS mount in Linux or<br>
OpenSolaris).<br>
<br>
The problem is, after I use the NFS mount to my new machine, it<br>
somehow causes OmniOS's NFS server to drop out, and say it's "offline"<br>
in, for instance, Napp-It, and the zfs filesystems are then<br>
inaccessible (though I can still look at the web status, and SSH into<br>
the box, so it's not a general problem). As a result, t<br>
<br>
Has anyone else ever seen this, where an NFS client can cause<br>
"nfs-server" on the host to freeze? I can reboot the server, but that<br>
is not a great solution, and would like to know what I can do to<br>
figure this problem out better. Thank you all in advance!<br>
<br>
Peter<br>
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</blockquote></div><br></div>
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