vSAN Stretched Cluster is a specific configuration implemented in environments where disaster/downtime avoidance is a key requirement.
New Concepts in vSAN - Stretched Clusters
A common question is how Stretched Clusters differ from Fault Domains, which is a vSAN feature that was introduced with vSAN version 6.0.
The witness host must be capable of running the same version of ESXi as vSAN data nodes.
Cluster Settings – vSphere HA
Certain vSphere HA behaviors have been modified especially for vSAN.
Using a vSAN Witness Appliance
vSAN StretchedCluster supports the use of a vSAN Witness Appliance
Configuring vSAN Stretched Cluster
There are two methods to configure a vSAN Stretched Cluster.
In this section, we will discuss the behavior of the vSAN Stretched Cluster when various failures occur.
2Individual Host Failure or Network Isolation
3Individual Drive Failure
4Site Failure or Network Partitions
5Multiple Simultaneous Failures
6Recovering from a Complete Site Failure
7How Read Locality is Established After Failover
8Replacing a Failed Witness Host
9VM Provisioning When a Site is Down
10Efficient inter-site resync for stretched clusters
11Failure Scenario Matrices
New ESXCLI commands for vSAN Stretched Cluster.