Stretched cluster witness failure resilience in vSAN 7.0

Cormac and I have been busy the past couple of weeks updating the vSAN Deep Dive to 7.0 U3. Yes, there is a lot to update and add, but we are actually going through it at a surprisingly rapid pace. I guess it helps that we had already written dozens of blog posts on the various topics we need to update or add. One of … [Read more...]

vSAN 7.0 U3 enhanced stretched cluster resiliency, what is it?

I briefly discussed the enhanced stretched cluster resiliency capability in my vSAN 7.0 U3 overview blog. Of course, immediately questions started popping up. I didn’t want to go too deep in that post as I figured I would do a separate post on the topic sooner or later. What does this functionality add, and in … [Read more...]

Can I make a host in a cluster the vSphere HA primary / master host?

There was an interesting question on the VMware VMTN Community this week, although I wrote about this in 2016 I figured I would do a short write-up again as the procedure changed since 7.0u1. The question was if it was possible to make a particular host in a cluster the vSphere HA primary (or master as it was called … [Read more...]

Does vSAN Enhanced Durability work when you have a limited number of hosts?

Last week I had a question about how vSAN Enhanced Durability works when you have a limited number of hosts. In this case, the customer had a 3+3+1 stretched cluster configuration, and they wondered what would happen when they would place a host into maintenance mode. Although I was pretty sure I knew what would … [Read more...]

vSAN File Services and Stretched Clusters!

As most of you probably know, vSAN File Services is not supported on a stretched cluster with vSAN 7.0 or 7.0U1. However, starting with vSAN 7.0 U2 we now fully support the use of vSAN File Services on a stretched cluster configuration! Why is that? In 7.0 U2, you now have the ability to specify during configuration of … [Read more...]

vSAN 7.0 U2 now integrates with vSphere DRS

One of the features our team requested a while back was integration between DRS and vSAN. The key use case we had was for stretched clusters. Especially in scenarios where a failure has occurred, it would be useful if DRS would understand what vSAN is doing. What do I mean by that? Today when customers create a … [Read more...]

VMs which are not stretched in a stretched cluster, which policy to use?

I’ve seen this question popping up regularly. Which policy setting (“site disaster tolerance” and “failures to tolerate”) should I use when I do not want to stretch my VMs? Well, that is actually pretty straight forward, in my opinion, you really only have two options you should ever use: … [Read more...]

vSphere HA reporting not enough failover resources fault with stretched cluster failure scenario

Last few months I had a couple of customers asking why vSphere HA was reporting “not enough failover resources” fault in a stretched cluster failure scenario for virtual machines that are still up and running. Now before I explain why, let’s paint a picture first to make it clear what is happening … [Read more...]

Creating a vSAN 7.0 Stretched Cluster

Advertise here with BSA A while ago I wrote this article and created this demo showing the creation of a vSAN Stretched Cluster. I bumped into the article/video today when I was looking for something and figured that it is time to recreate the vSAN Stretched Cluster demo. I recorded it today, using vSphere / vSAN 7, … [Read more...]

vSAN/DRS awareness to be introduced in vSAN/vSphere 7.0!

Advertise here with BSA It was briefly mentioned here, but I figured I would elaborate on this new cool feature for vSAN Stretched Clusters which is DRS Awareness of vSAN Stretched Clusters. So what does this mean? Well, it is fairly straight forward. DRS will take vSAN resync traffic into consideration when the DRS … [Read more...]