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 edition with vSAN 6.6.1, you get the full feature set of vSAN on 2-node deployments. This new edition builds on the vSAN Advanced edition, and enables the use of features like native encryption and stretched clusters on a per-VM pricing model for smaller sites. The…

2-node vSAN topologies review

There has been a lot of discussion in the past around supported topologies for 2-node vSAN, specifically around where we can host the witness. Now my good pal Duncan has already highlighted some of this in his blog post here, but the questions continue to come up about where I can, and where I cannot place the witness for a 2-node vSAN deployment. I also want to highlight that many of these configuration considerations are covered by our official documentation. For example, there is the very comprehensive VMware Virtual SAN 6.2 for Remote Office and Branch Office Deployment Reference Architecture…

What’s new in Virtual SAN 6.5

I know that there will be a lot of information coming your way from various sources on this exact topic. Obviously, I would urge you to check out the latest and greatest documentation from our technical marketing guys for deeper detail and “how-to” guides. However, I did want to provide a brief overview of what new VSAN features are available in vSphere 6.5. Note that we also refer to this version of VSAN as 6.5.

VSAN 6.2 Part 9 – Replacing the witness appliance

There might be a reason in VSAN stretched cluster environments or in 2-node VSAN ROBO deployments to change the witness appliance. The one thing to keep in mind is that you must use a witness appliance that has the same on-disk format as the rest of the disk groups in the cluster. Right now, there is a 6.1 version of the appliance and a 6.2 version of the appliance, so make sure that you select the correct one. Replacing the current witness with a new witness is very straight forward, and the tasks can be summarized as follows: Deploy the…

A closer look at the VSAN witness appliance

As part of the Virtual SAN 6.1 announcements at VMworld 2015, VMware announced two new, eagerly anticipated features. The first of these is VSAN stretched cluster, allowing you to protect your virtual machines across data centers, not just racks. And the second is 2-node VSAN, which will be an excellent solution for remote office/branch office (ROBO) configurations. To allow these configuration to work, a dedicated witness host is required. For those of you already familiar with VSAN,  a witness component is used in the event of a split brain to figure out if the virtual machine objects have a quorum.…