Overview of the active-active solution for VxRail

The vSAN stretched cluster on VxRail can deliver an active-active cluster between two geographically separate locations and synchronously replicate data between sites. This feature allows an entire site failure to be tolerated. It extends the concept of fault domains to data center awareness domains. The vSAN stretched cluster must build on between two separate sites (the preferred and secondary site). Each stretched cluster includes two data sites and one witness site. The witness host contains the witness components of the VM objects. The witness host is used as a decision maker that monitors the availability of datastore components when the network connection between the preferred and secondary sites is lost. The witness host can either be a VM or a physical machine.

Now we will have an overview of the logical diagram of the active-active solution for VxRail. In Figure 9.1, we can see that there are three separate sites: they...