Then, depending on the number of Failures to tolerate, each object might have additional replicas or parity components placed on different hosts/devices inside each site. Each VM object should have at least one complete replica on each site to satisfy a policy consisting of “Site disaster tolerance =1”, which is the default policy for this type of cluster. Stretched cluster implements the same model by extending it on a per site level and introducing the witness host as a tiebreaker in case of a failure scenario. The Fault domain concept represents a specific vSAN approach where it treats each host as an independent failure domain, and it makes sure that each component of a given VM object is placed onto a separate host for redundancy. vSAN Stretched cluster resolves the site availability issue by building on top of the concept of a fault domain. Whenever there’s a risk of a failure of an entire site, vSAN Stretched cluster is the recommended configuration to alleviate this type of temporary workload interruption. Why do we need a witness host and how does it work? This witness appliance VM is treated as an ESXi host and will be represented in blue in the vSphere user interface. The witness appliance can be deployed using an OVA template and does not require an additional vSphere license. Each vSAN witness host can be deployed as a witness appliance. The vSAN witness host is basically an ESXi host that does not store VM data but only VM metadata, or in other terms, it stores the witness components for each VM object from a Stretched cluster or a 2-node cluster configuration. Additionally, we’ll cover some more insights around the witness host configuration, witness lifecycle, what are the options for deployment, and are there any specifics when deployed on VMC on AWS or VMware Cloud Foundation (VCF). Let’s dive into the details.
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