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”
By default, vCloud Director does not limit the size of memory, disks and number of vCPUs when creating a new virtual machine. This means the global configuration maximums for vSphere apply, which can be a problem for a service provider. Depending on the settings in the allocation model that a SP uses.
Continue reading “How to change virtual machine limits in vCloud Director”
If you have already worked with IPv6 Default Routes in NSX 6.3, you may know the following problems: You set a static default route to ::/0, save your change and when you reload the page, the change is gone.
Or you want to upgrade the NSX Edge Gateways from version 6.2.x to 6.3.x and the Edge upgrade fails with an IPv6 error message.
Continue reading “Set an IPv6 default route in NSX 6.3”