Been using XCP-NG on our servers here at work for a few years now after moving off of hyper-v. We run exchange in house here, and in running the health checker script I noticed an error about the packets being discarded. I tried both the xcp and the citrix drivers but the result is the same. There are no NIC power management settings in any of the tabs and I did run the powershell command to disable nic power management just in case but the errors persist. I booted up one of the VMs on the old hyper V server as a test and it did not have these errors. The event lots also don’t have any useful info.
I also tested the MTU and it appears 1500 is correct (1472+28).
I haven’t noticed any problems in production but having all the checks in the green would be nice. Any thoughts would be appreciated!
What health checker script are you running?
It’s a script from Microsoft that gives you a general overall status of your exchange servers.
This is the check that it is failing on:
We haven’t had any issues, and I was able to replicate the issue on another server (Both Dells, a T430 and an r730).
Last night I turned off offloading using this script, we’ll see what happens:
Not something I have tested for or had an issue with. Maybe someone here will have some more insight or you could post inthe XCP-NG forums.
Yeah, I’ll try posting there. And will update this thread if something useful comes around.
I’d try this first:
netsh int tcp set global autotuninglevel=disabled
saves my ass frequently
turn all back:
netsh int tcp set global autotuninglevel=normal
Just tried it and sadly still getting the packet loss in the performance counter:
I posted in the XCP-NG forums as well, will post back here if there are any updates.
Just to follow up on this, I have tested with some other servers and have found it is only the BROADCOM network adapters having this issue. Crappy Broadcom NICs in dell servers strike again.
Actually aligning MTU size obviously the main reason of many miracles. Just fought with bunch of it.
Than we are in bridge/vlan space it may decreases a little bit.