[SOLVED] Strange NFS Problem

[buliwyf]

Hello there,

i have a strange Problem with a nfs mount.

I switched from Vmware to Proxmox.
I migrated multiple VMs with "qemu-img convert"

This virtual machine mounts a nfs from a Synology Diskstation.
But this is not reliable. Sometimes right after the boot i can't even "ls"
the directory, the command just hangs. I do not get a response at all.
In the Kernel Log file i find the following entry
nfs: server 192.168.xxx.xxx not responding, timed out.
"mount" tells me that the share is mounted

The machine still has the same IP-address as before and worked under VMware flawlessly for months.

I have no idea what causes this. I already tried changing the Mount Parameters
or nfs Protocol Version. But nothing helped.

The PVE Version is the latest
The VM is a Ubuntu 15.10 with the 4.2.0-30-generic Kernel.
I tried the virtio and the E1000 Driver

Had anybody already had such a problem.?

Thanks for your help

 

[buliwyf]

I found the problem.
On Vmware i used mtu 9000 in the VM for Jumbo Frames.

So you know where this is going.

It's looking good for now.