vCloud Architecture Toolkit for Service Providers – What is it?

VMware recently released the latest version 2.5 of the vCloud Architecture Toolkit for Service Providers (vCAT-SP). But I know that many service and cloud providers around the globe don’t know what that is and that something like that even exists.

I will therefore try to give a brief overview and introduction to this topic and hopefully show how powerful this toolkit can be for your business.

Continue reading “vCloud Architecture Toolkit for Service Providers – What is it?”



ESXi 6.x, Intel X710 and malicious driver event

Two of our vSAN clusters consist of VxRail S570 nodes with Intel X710 NICs. A few weeks ago the ESXi 6.5 hosts failed again and again. Not all at once but a different host every time. Failed means the host was displayed as “not responding” in the vSphere client and VMs stopped running and were restarted by vSphere Availability on other hosts.

Of course we thought of a network error at first, but on the physical upstream switches there were no related events in the logs and also all other hosts were not affected.

Continue reading “ESXi 6.x, Intel X710 and malicious driver event”





Understanding congestion in vSAN

If things go wrong in a VMware vSAN 6.x environment you may see congestion warnings and errors – usually in hybrid setups. I try to explain what congestion means in the world of vSAN, why it’s a problem and how to deal with it.

What is congestion?

In short, congestion occurs when you have a bottleneck in the lower layers of your vSAN infrastructure. Or, more concretely: The destaging process of the incoming data, from the flash cache to the capacity disks, is so heavy that one layer of vSAN cannot handle this amount of data.

Continue reading “Understanding congestion in vSAN”