Category Archives: Virtualization

VUM: Cannot update ESXi host after vCenter 6.7 Upgrade

We updated our vCenters (3 of them) to version 6.7 but after the update there were problems with upgrading our ESXi nodes. It turns out that once you’re on 6.7 you cannot update your ESXi nodes to a “lesser” version through the Update Manager, which was 6.5 in our case. But since I was half way through the… Read More »

Critical: “Host hardware system board status”

ESXi host has critical error message: In the Hardware Health section you see: This is because the System event log is full, this has no impact on the corresponding blade, it’s just that new logs are not being logged because it is full. To resolve this issue you need to clear the logs in the CIMC for the… Read More »

vSphere Host Profiles: “Number of network stack instances don’t match”

So I encountered these errors while configuring some of our ESXi nodes in the test cluster. The accompanied error message is: ” “Host is not in compliance with the attached profile” After a search on the web I came across the blog of vMBaggum which led to the solution.To solve this problem open an SSH connection to a… Read More »

Enable MOB Service

When trying to reach the MOB service you get the below error message: 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x04e027b8] _serverNamespace = /mob action = Allow _pipeName =/var/run/vmware/proxy-mob) By default the MOB service is disabled. You can enable this service in the vCenter inventory by selecting the ESXi host, go to “System” —> “Advanced System Settings”… Read More »

PowerCLI “Oneliners”

Get ESXi hosts versioning: List VM’s and host details The other day there were some issues with the storage system of our management environment at our secondary site and we had to do some onsite troubleshooting. As a precaution we turned off the running VM’s, before doing this we wanted to know where the VM’s resides on which… Read More »

Fix issue with viewing Update Manager “Class Loader…”

When selecting the Updatemanager through the vSphere Web-client you get the below error message message: “interface com.vmware.vim.binding.integrity.VcIntegrity is not visible from class loader” vCenter & ESXi version: 6.5U2 / ESXi 6.0 Several attempts in trying to solve the problem were: Restarting the VUM services Restarting vCenter services Reference: We really didn’t want to restart the vCenter services… Read More »