New vSAN 6.7U1 Advanced Options

Most readers will be aware that vSAN version 6.7U1 was recently released. For those of you who wish to know more about the release, I wrote this blog article last month detailing the new features. In this post I want to cover an item which many of you may not be aware of. It is a new feature which makes the most common vSAN advanced options visible and configurable in the vSphere UI. There are 3 advanced options which we have surfaced up. The first is the VSAN.ClomRepairDelay timer which is the delay used before rebuilding ABSENT components. The second…

vSAN Stretched Cluster and Horizon View interop update

This question has come up a number of times in the past. However, there have been some updates that I personally was not aware of until last week. To cut to the chase, Horizon View 7 (all clone types) is supported with vSAN stretch cluster. This is good news. However, it is very important that customers should follow the Horizon View Reference Architecture (RA) design document and test the scalability of  Horizon 7 and vSAN Stretched Clusters in their environment.

Why upgrade vSAN? Here is a list of features, release by release.

I was with one of our large EMEA customers last week, and we talked quite a bit about the evolution of vSAN. This customer is already one of our larger vSAN customers with very many clusters, and many, many nodes. They have also been a great vSAN reference for us, having first deployed the initial vSAN 5.5 release. One point that hit home was that they found it was quite difficult to determine the various features and enhancements that were introduced in each vSAN release. They mentioned that having a quick reference would be useful as they could use it…

What’s in the vSphere and vSAN 6.7 release?

Today VMware unveils vSphere version 6.7, which also includes a new version of vSAN. In this post, I am going to highlight some of the big-ticket items that are in vSphere 6.7 from a core storage perspective, and also some of the new feature that you will find in vSAN 6.7. I’ll also cover some of the new enhancements coming in Virtual Volumes (VVols).

How many hosts are needed to implement SFTT in vSAN Stretched Cluster?

Many of you who are well versed in vSAN will realize that we released a Secondary Failures To Tolerate (SFTT) feature with vSAN 6.6. This meant that not only could we tolerate failures across sites, but that we could also add another layer of redundancy to each copy of the data maintained at each of the data sites. Of course the cross site replication (now referred to as PFTT or Primary Failures To Tolerate) is still based on RAID-1 mirroring and this continues to require a third site for the witness appliance, so that quorum can be obtained in the…

New vSAN Stretched Cluster Topology now supported

After publishing the vSAN Networking Guide earlier this year, Paudie O’Riordain and I received numerous questions regarding support on having different stretched clusters hosting each other’s witness appliances. These queries arose because we discussed a 2-node (ROBO) topology which allowed this to sort of configuration (i.e. the cross hosting of witnesses) via special request. But in the networking guide, we explicitly stated that this was not supported with vSAN stretched clusters. However, after some further testing by our engineering teams, we can now relax this restriction if there are 4 independent sites hosting the different stretched clusters. In this case,…

Erasure Coding and Quorum on vSAN

I was looking at the layout of RAID-5 object configuration the other day, and while these objects were deployed on vSAN with 4 components, something caught my eye. It wasn’t the fact that there were 4 components, which is what one would expect since we implement RAID-5 as a 3+1, i.e. 3 data segments and 1 parity segment. No, what caught my eye was that one of the components had a different vote count. Now, RAID-5 and RAID-6 erasure coding configurations are not the same as RAID-1. With RAID-1, we deploy multiple copies of the data depending on how many…