checksum erasure coding IOPS Limit stretched cluster VMware VSAN vSphere witness host

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 […]

ESXi iSCSI Storage stretched cluster VAAI VASA VMFS VMware VSAN vSphere VVols witness host

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 […]

Networking Storage VMware VSAN vSphere witness host

2-node vSAN – witness network design considerations

It seems that 2-node vSAN for ROBO (remote office/branch office) deployments are becoming more and more popular. The fact that one can now connect the 2 vSAN hosts at the remote office directly back-to-back without needing a 10Gb switch has reduced the cost extensively. And with the introduction of a vSAN Enterprise for ROBO license […]

stretched cluster VMware VSAN vSphere witness host

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 […]

erasure coding stretched cluster VM Storage Policies VMware VSAN vSphere witness host

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 […]

Storage stretched cluster VMware VSAN vSphere witness host

Why two stretched clusters cannot cross-host each others witness appliances!

Sorry about the wordy title but this is a question that has come up a number of times. The request is that when I have two data sites and deploy two stretched clusters across these data sites, can the other stretched cluster support the witness appliance for this stretched cluster, and vice-versa? The answer is […]

deduplication DRS Encryption stretched cluster VMware VSAN vSphere HA witness host

What’s new in vSAN 6.6?

vSAN 6.6 is finally here. This sixth iteration of vSAN is the quite a significant release for many reasons, as you will read about shortly. In my opinion, this may be the vSAN release with the most amount of new features. Let’s cut straight to the chase and highlight all the features of this next […]