RHEV - install of VMs issues

Latest response

Hi,

For a very long time (started with rhev 3.0 and still exists in rhev 3.2) we have had issues when installing a VM.
The issue seemed to be the NFS-share from which the iso we start the installation.

The problem:
I attach a bootable ISO which is 40MB.
I start the VM in "run once" with the ISO attached.

The VM goes to "starting up", nothing happens, and then to "Not responding".
If I log into the host and try listing the files in NFS share (or running df) it hangs/freezes.
Going back to the GUI I can see the ISO storage has changed to "inactive".
In this state it sits for a very long time.

What makes matter worse:
Sometimes it works.
It's not related to a single host or a single network.
The NFS share works if I try accessing it from a server (in the same network as the NFS-server).
IT could be network-related.
We have following ports open between hosts and NFS-server:
TCP and UDP: 2049, 111, 892 and 662.
TCP only: 32803
UDP only: 32769

Anyone have the same/similiar issue? Any advise on debugging this?

Responses

I was involved in troubleshooting a similar issue recently and turned out a bad firewall between nfs server and rhev hyprevisors was causing this.

So, for testing, turn off all firewalls between nfs server and hypervisor and re-test.

Not possible for me in the current setup and environment.
Have collected data while experiencing the issue with tcpdump and provided them to Red Hat support. Hopefully they will find the root cause.

Great. Please follow up here with anything you learn through the support case!

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