[Discuss] nfs in virtual machines

[markw at mohawksoft.com (markw at mohawksoft.com)]

Is the hypervisor under load?

Run sar on both.

> All this talk of virtual machines reminded me that there might be some
> experts out there that could help with a problem that's been with me for
> a while.
>
> I have a server that is on all the time and serves NFS.  I have a linux
> VM that runs on windows host (virtualbox), and the linux guest mounts
> the home directory from the server (to be clear, the NFS server is not
> the same box as the VM host).
>
> The guest VM is set up for NAT.
>
> The problem is that every 5 or 10 minutes, the machine is just not
> responsive.  'ls' on the home directory will just hang for like a
> minute.  Terminal windows are fine and can execute commands until you
> run a command that does anything with the NFS mount.  Also can't launch
> new terminals at that point because it wants to read your ~/.bashrc
>
> Eventually it will come back and is zippy.
>
> I'm pulling my hair out trying to figure out how to debug this.  It
> feels like a pure NFS problem; the VM host has plenty of memory and
> isn't pausing the VM; the UI in the guest is generally responsive except
> for the windows that are blocked waiting to read/write something from ~
>
> Nothing really useful is in the syslog or journalctl.
>
> Any ideas on where to look or things to try?
>
> Thanks
> Matt
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