- Data Center Virtualization Certification：VCP6.5-DCV Exam Guide
- Andrea Mauro Paolo Valsecchi
- 129字
- 2025-03-01 05:40:56
Explaining vSAN failure domains functionality
A fault domain is a set of elements that can fail together without causing any issue due to a proper redundancy across different fault domains.
By default, in vSAN, each host is an implicit "fault domain", but you can group one or more hosts in an explicit fault domain, according to their physical location in the datacenter.
Using vSAN's fault domains feature, it's possible to protect against rack or chassis failure if your vSAN cluster spans across multiple racks or blade server chassis.
A minimum of three fault domains are required for a vSAN cluster. But, depending on the FFT value, the real required minimum number is 2*FTT+1 fault domains in a cluster.
For more information, see the administering VMware vSAN guide (https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-8491C4B0-6F94-4023-8C7A-FD7B40D0368D.html).