Hello,
I would agree Herman and would check this with support for best practices.
I mostly try to prevent VMC‘s (or conductors) to be migrated between hosts.
There are HA functions like master/backup (I think active/standby ist the new designation) or clustering within the aruba world, which can be used.
So if VMC one fails, VMC two should stay alive and take over.
Do not operate a pair of VMC‘s on the same host.
If you use automated balancing like VMware DRS, I would remove the VMC‘s from the policies for migrations and place them on hosts which are „always running“ and which only would be offline in maintenance windows…
Anyway, you wrote, the VMC lost it‘s license config.
This could be a indication that the MAC of the vnic was lost after the migration.
A week ago, I saw a ClearPass server loosing it‘s connection on a Hyper-V host after a reboot.
The cause was, that Hyper-V mixed up the MAC addresses between the vnics in some kind of way.
There were two vnics, the unused one was not connected to a vswitch.
After we were just connecting the second one (without an additional reboot) the connection to the first vnic was restored.
We then disconnected the second nic again and the connection remained stable ^^
I‘m no virtualization expert, but I never saw this on vmware…
The server guy was not able to explain to me what was happening.
I do not know, if there is a misconfiguration in the Hyper-V SDN stack or it is a Hyper-V BUG.
May check if you can find an MAC entry of your VMC on the uplink switch to the target host after migration. Or if you find an ARP entry for it on your GW.
We were successful with this strategy at troubleshooting.
The issue was reported at Hyper-V 2019, but with ClearPass VM and not VMC.
But I guess this is an issue related to any guest VM with two or more nics, may related to Linux ….
Regards
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Best regards, mom
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Original Message:
Sent: Apr 13, 2023
From: Herman Robers
Subject: RE: ArubaMC-VA losing network after HyperV live migration
I can imagine that live migration is not supported for a VMC. The VMC does some advanced things to get raw network access, and that may be non-compatible with live-migrations. You may ask Aruba Support if your scenario is supported, and if so what are the best-practices or constraints.
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Herman Robers
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If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
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Original Message:
Sent: Apr 13, 2023 05:32 AM
From: adavisonrhs
Subject: ArubaMC-VA losing network after HyperV live migration
Hi,
We have an ArubaMC-VA running ArubaOS 8.10.0.2.
We have noticed that often, after a live migration on a two-node HCI HyperV stack, our controller will lose network connectivity until we reboot it. A reboot will bring the connectivity back up.
We had had an issue when a HCI node went down that the controller would lose its license config; as part of the diagnostics we decided to carry out several live migrations to see if this would cause the license to drop. It kept thee licence, but we then noticed the network connectivity issue.
We tested yesterday and 5 out of 6 live migrations caused the controller to lose connection to the network.
We have a static MAC assigned to both of the network connections in use.
Has any one else experienced a similar problem? Any ideas?
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Kind regards,
Alex
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