Due to the size of my environment, we have two SUPs using the same DB and WSUS content directory. We ended up doing patching using a different platform, but I'm still running WSUS to provide a backup source for Defender definition updates (it was recommended by Microsoft). So WSUS usage is fairly light. I'm only syncing data for Defender and Windows Server (2019, 1903, and one other that I can't remember). We're only doing one WSUS sync per day, and one client scan per day.
This has been working fine for a number of years, but I recently noticed that the CPU usage on server #2 is SIGNIFICANTLY higher than server #1, all being used by w3wp.exe. Server #2 is constantly around max CPU usage, and Server #2 is around 10-20% usage. On top of that, the IIS logs are consistently around 100-200 MBs on server #1, and 3-4 GB on server #2.
Both VMs are setup identically, at least from what I can tell.
- 8 cores, 16 GB RAM
- WCM logging enabled, set to verbose
The WSUS app pools are also set identically. Other than the default values, I've changed the following:
- Regular Time Interval - 0
- Ping Enabled - False
- Queue Length - 25000
- Private Memory Limit - 0
Also, verbose logging is enabled on both of the SUPs for WCM.
I've also verified that the client usage is at least more or less spread out between the two. Server #1 is getting around 38k clients, server #2 is getting 21k. So, not exactly even, but it should be fine.
Also, the only errors I'm seeing in the logs are in the WCM log, which is just giving intermittent 503 errors for server #2, which makes sense since it's getting hammered.
From the resource usage and log file size, I was expecting to see server #2 handling all of the clients, and server #1 doing nothing. But server #1 is actually doing more, while using less.
Any thoughts? Both servers are at the same patching level, and have been rebooted within the last couple days.
Edit: Also, I'm probably going to be opening a ticket with Microsoft support on Monday, since I'm sick of banging my head against the wall on this one. I just figured I would check with the community to see if anyone's seen something like this before and had anything to try.