VMware vSAN - Management and Operations - Cornerstone

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Starting with VxRail v4.7.410, vSAN 2-node cluster with switch configuration is also supported. The vSAN 2 Node Cluster needs to have the Witness Host in a different location, usually in the main datacenter. The configuration that VMware recommends is to deploy several remote offices with 2 Node Clusters while hosting all the Witness Hosts (or appliances) within your main datacenter. I am using default option to build vSAN for this demo, In the vSAN, There is a limitation of a 2 or 3 host cluster configuration, you can bear only one host failure by cluster setting option of host failure to tolerate 1. VMware vSAN keeps each of the 2 necessary copies of VM data on distinct esxi hosts. The witness object is on a third host. 2 standalone ESXi hosts, each having a configured diskgroup.

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I am using default option to build vSAN for this demo, In the vSAN, There is a limitation of a 2 or 3 host cluster configuration, you can bear only one host failure by cluster setting option of host failure to tolerate 1. VMware vSAN keeps each of the 2 necessary copies of VM data on distinct esxi hosts. The witness object is on a third host.

VMware – Page 3 – Virtual thoughts

VMware – Page 3 – Virtual thoughts

If not, you will need to go back and do this on the esxi hosts. Introduction to 2-Node vSAN Cluster The vSAN 2 Node configuration initially introduced in vSAN 6.1. Prior to 2-node vSAN, three-node clusters was the minimum supported configuration for vSAN enabled environments. VMware vSAN 2 Node Clusters are supported on both Hybrid configurations and All-Flash configurations. A 2-node cluster is very useful in case of ROBO (Remote office Branch office). […] First of all, connect to your vSphere Web Client and navigate to Hosts and Clusters.

Site 1 contains one physical ESXi host; Site 2 contains one physical ESXi host; Site 3 contains the vSAN Witness Host (virtual appliance or physical). The configuration is 1+1+1. This is commonly referred to as a 2 Node configuration. Go to the Fault Domains & Stretched Cluster section under “Virtual SAN” and click Configure. And one host to “preferred” and one to “secondary” fault domain: Select the Witness host: Select the witness disks for the vSAN cluster: Click Finish: And then the 2-node stretched cluster is formed using a Standard or ROBO license: VMware vSAN 2-node cluster is a configuration that is implemented in environments where a minimal configuration is a key requirement.
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In vCenter, create a new cluster within your ROBO site. Do not enable DRS or HA while creating the vSAN cluster object.

vSAN can be deployed from 2 nodes to 16 nodes. 2-node cluster should be used for ROBO (Remote Office and Branch Office). A 2-node cluster requires a Witness Appliance provided by VMware freely while the appliance is virtual.
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In your on-premises cluster, create the vSAN. Start by right-clicking on the Cluster and select “Settings”: Under vSAN, select “Services” and click “Configure…” Note that I am choosing to configure a 2-node vSAN cluster with a remote witness. We need to add the second hosts disks to the vSAN cluster.

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I was especially concerned to read that when they introduced a failure and then fixed that failure, they did not experience any auto-recovery. I have reached out to the authors of the post, just to check out some things such as version of vSAN, type of failure, etc. Unfortunately I haven Example 2 - Put the host into maintenance mode. Copy all VSAN components to other hosts in the cluster: /localhost/DC> vsan.enter_maintenance_mode ~esx -v evacuateAllData EnterMaintenanceMode esx1.virten.local: success.