2 Node Virtual SAN (ROBO VSAN) Deployment

I’ve been asked a few times over the last few weeks for deployment guides or white papers for 2 Node Virtual SAN, typically used to support remote offices (ROBO VSAN). VMware currently doesn’t have specific documentation that I can find but it’s essentially the same process as building a stretched cluster, which is documented in the Administering VMware Virtual SAN guide and the Virtual SAN Stretched Clustering Guide. The difference is that with 2 node VSAN, the two fault domains only have 1 node each and are located in the same site.  We expect the witness VM to be installed on a host back in the primary data center.  The latency of the WAN link back to the primary data center can be up to 500ms and the bandwidth must be a minimum of 1.5Mbps.

In the Administering VMware Virtual SAN guide, we detail how to build a stretched cluster starting on page 51.

http://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/virtual-san-61-administration-guide.pdf

So, basically follow these steps, create two fault domains with 1 host in each and locate them on the same site.  Then deploy the Witness VM back in the production data center. The networking requirements are less complicated since you don’t have to worry about using a Layer 2 stretched or a Layer 3 network between data sites. VSAN supports a Layer 3 network between the ROBO sites and the witness host site.

vsan-robo-wit

Here are a few other helpful blog posts on 2 Node VSAN (ROBO VSAN):

VMware Virtual SAN ROBO Edition

VMware Virtual SAN Cluster ROBO Edition: Configuration Demonstration

2 is the minimum number of hosts for VSAN if you ask me

Virtual SAN Licensing And Packaging For Virtual SAN 6.1

One thought on “2 Node Virtual SAN (ROBO VSAN) Deployment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s