With VSAN 6.2, VMware simplified the process of deploying VSAN Stretched and VSAN two host cluster. VSAN Stretched cluster allows to protect virtual machines across data centers where as 2-node VSAN is an excellent solution for remote office / branch office (ROBO) configuration. In both the scenarios, a dedicated witness host is required.
Virtual SAN for ROBO use Fault Domains, where in this case the required failure zones are based on three nodes (two physical nodes and witness node). Witness node are used to provide an availability mechanism to virtual machines. Witnesses plays an important role in ensuring that more than 50% of the components of an object remain available. Instead of deploying a dedicated physical ESXi host to be a witness host, as well as consume a license for the witness host, Vmware deployed the VSAN witness appliance to take care of the witness requirements. There are no licenses needed with the witness appliance, as it comes per-configured with a license. Of course, if you wish to use a physical host for the witness, you can do that too.
If you choose to use witness host as a physical server not a witness appliance, it is required to do the configuration manually on the host.
You should have
- One flash
- One capacity disk.
- One Port Group to have VSAN Traffic enabled.
- Witness host should not be part of VSAN Cluster
In Lab I have deployed a physical host to be used as Witness host. You can use the Configure Virtual SAN wizard to complete the basic configuration of your Virtual SAN cluster.
- Navigate to an existing cluster in the vSphere Web Client.
- Click the Manage tab and click Settings.
- Under Virtual SAN, select General and click Configure to open the Configure Virtual SAN wizard.
Choose appropriate Disk Claiming technique to your environment.
- Automatic: Claims all empty devices on the included hosts for Virtual SAN.
- Manual : Requires manual claiming of the devices on the included hosts.
Choose Two host Virtual VSAN Cluster. Configuration Wizard will check if VSAN Traffic is allowed on atleast one portgroup on both the nodes of the cluster.Mark disk to be used for Capacity / Cache Tier. Click Next. Select the node to be used as Witness Host.Mark the disk for Cache / Capacity Tier on the witness host and click NEXT.Click Finish to proceed further.Once configured, one of the node will be marked as Preferred and other will be Secondary.The virtual machine components will be scattered across nodes ensuring that more than 50% of the components of an object remain available in case of host failure.
This conclude the deployment of VSAN 2 Node Cluster using VSAN Configuration wizard in VSAN 6.2. I hope this is informative for you. Thanks for reading !!!. Be social and share it in social media, if you feel worth sharing it.