Category: VMware

30.11.2024

A problem with one or more vFAT bootbank partitions was detected. (PSOD Alarm!)

During a VMware vSphere 7 to 8 upgrade, more precisely after the compliance check, I was confronted with the above error message. In this blog post I would like to show you how to solve the problem. Corrupt vFAT partitions already existed in vSphere 6.7 times and unfortunately they also appear today with vSphere 8. The problem? If you go through with the upgrade in […]

06.11.2024

Moving a vSAN cluster from one vCenter Server to another

vSphere 7 to 8 updates are slowly in full swing, many customers are migrating to October ’25 -> EOL for vSphere 7. Some of my customers want a brand new vCenter right away, because some of theirs are still from version 5, the ex-colleague fiddled in the Postgre database before he quit and so on and so forth – the reasons seem to be endless. […]

04.11.2024

Image Compliance shows hardware compatibility issues

During an ESX server cluster update on image basis, I was confronted with a strange thing. The message says that there are hardware compatibility issues. However, if you look at the details, you will quickly realise that there is nothing under the firmware version. If you then scroll down a little, you will see the warning ‘Device is incompatible with the Driver/Firmware in clusters image‘. […]

28.10.2024

vSphere UI Client Plugin is at N/A state before vSphere 8 Upgrade

We are rapidly approaching the end of vSphere 7 support (October ’25), and during a vSphere 8 upgrade pre-check at my customer’s site, we ran into the problem mentioned in the title. The so-called “…vmware.h4…” plugin was in a N/A state. In the past this plugin has appeared several times and should be unregister beforehand, this is the VMware Cloud Director Availability Plugin, which cannot […]

19.10.2024

Generate a VMware Aria Operations Passphrase for Node Adding

For new deployments or extensions of Aria Operations Cluster, the admin credentials are required to add the nodes. To prevent this, especially as a security concern, the administrator can generate a temporary passphrase in the Admin Console of Aria Operations. I would like to describe how this works in this blog post. First, we log in to the admin console of Aria Operations: Under “Nodes […]

26.06.2024

PowerCLI Add-VMHost: Unable to verify the authenticity of the specified host

Yep, I also started using PowerCLI more intensively. It’s really fun and makes repeating tasks easier to apply. As a Rookie in whatever you’re starting out with, there are obstacles that you might not be able to explain straight away. So let’s start with something small and I wanted to add an ESX host to my vCenter with the following command: But this failed because […]

11.06.2024

vSAN Skyline Health: A possible storage capacity limitation with vSAN OSA versions 8.0U2 and 8.0U2b

Another Day another Warning inside vSAN Skyline Health. 🙂 Frequent Deletion of VMs….. Hmm….. I’ve been using vSAN since vSphere 6.7 U3 in my home lab and I’m pretty sure I deleted VMs more frequently, especially in my rookie times and never had this kind of warning in vSAN Skyline Health. Anyway, lets try to fix it! 😉 What I really like about vSphere 8 […]

10.06.2024

vSAN Skyline Health: Network diagnostic mode (Warning)

Today, I saw the above warning in vSAN Skyline Health, and I would like to share the solution with you. The following information can be found under Details: Network diagnostic mode is enabled more than 24 hours (94 hours). The network diagnostic mode is only used for troubleshooting, if the troubleshooting is done, please disable it. No sooner said than done, we switch to the […]

22.03.2024

The number of VMware vSphere HA datastores for this host is 0, which is less than required: 2

Recently I had the situation that at cluster level, the vSphere HA displayed a heartbeat of datastores at zero, whereby I have defined two specific datastores under vSphere HA settings under Heartbeat Datastores and these must always be pingable. The two defined datastores were no longer visible under Datastores, which is why the warning appeared. After consulting with the storage team, it turned out that […]

01.03.2024

How to Reset vCenter 8.0 Root Password

Yep, there are still vCenter’s out there with expired root passwords. 😀 Therefore, I will describe the workaround to reset the root password for vCenter 8.0, which also works for vSphere 6.5 through today’s releases. First, take a snapshot of your vCenter VM: Then switch to the ESXi Host Client and open a virtual console from the vCenter VM: Now reboot the vCenter and watch […]