Scaling VSAN: Adding a New VSAN Host

In my previous post, VMware VSAN Meets EZLAB, I highlighted the implementation of VSAN into my vCloud lab. At the time of writing, 1 of 4 my vSphere hosts was down for maintenance and was not added to the VSAN cluster. Now that it’s back online, I thought I would share the experience of adding a new VSAN host…and another 2.25TB of capacity.

Here’s a “before” shot — 3 hosts configured with 6.13TB total capacity…

Step 1: Add the host to the existing VSAN cluster: I’m pretty sure I don’t have to review how this is done. Once added, configure all settings to match the other hosts in the cluster…in my setup I’m using a dedicated pNIC and vmkernel port (vmk1) for all storage traffic.

Adding new host to the vSphere cluster

The local storage of the new host, a Dell R610 box, is configured identically to the other
three — 1 x 256GB SSD + 3 x 750GB SATA drives. And since it is
identical, that also means I had to deal with the fact that the PERC 6/i
controller does not support JBOD. So, I stepped through the work-around to identify the SSD as such…

before…the SSD show up as “Non-SSD”


“esxcli storage…” command executed on host



the SSD is now recognized as an SSD drive


Step 2: Enable VSAN Service on the vmk port…

Configure vmk for VSAN traffic

Step 3: Disk Management…

Since my VSAN cluster is configured to “Manual” mode, adding the new host’s disks to the cluster takes an additional step.…

VMware VSAN meets EZLAB

Let me just get this out of the way – I’m a HUGE fan of VSAN (aka VMware Virtual SAN). I was first in line to drink the kool-aid when VSAN was nothing but a “what if…?”. Fast forward to the present — VSAN beta (refresh) is backing my entire lab. I’m tweaking, testing, breaking (learning), and sharing my thoughts on VSAN’s capabilities, performance, and benefits ahead of the official launch. This is all in good order because even the beta has exceeded my expectations in what VMware would ship as a 1.0 product.

I can write page after page about the ins-and-outs of VSAN, but fortunately several very respected individuals have already done so. For starters, Duncan Epping at yellow-bricks.com not only is a massive contributor to the cause, but has also put together a nice list of VSAN resources from around the web that is a must-see. But lets face it, if you’re tracking VSAN you’ve probably already been there, done that 🙂  So for this post, I’m going to focus instead on my VSAN home lab build and experiences thus far. I’ve shared several preliminary stats on twitter (here, here, and here) ahead of any tweaking and will be sure to post additional results as I play with things a bit more.…