vSphere Host Isolation Response for Nutanix
First I would like to start with reference. As it is primary source of my understanding. Therefore credits are due.
Turn off the default isolation address
Non-availability of management gateway do not necessarily suggest VMs are isolated. Nutanix presents datastore as NFS mount which is network based storage. Therefore availability of vmkernel management network is not suitable and may cause false alerts.
Change from default configuration. Must be documented in operations guide
das.isolationaddress1 : DSF Cluster IP Address
Configure Host Isolation Response to: Power Off
In Nutanix, CVM is responsible for presenting storage. To reliably identify availability storage, IP Address of CVM cluster will be used. If cluster CVM IP is not reachable, it suggest catastrophic condition has occurred as node cannot function. When CVM is not reachable either host is isolated or entire infrastructure has gone down, in such scenario it is recommended to power off VMs.
CVM communicate with each other and are load balanced. Non availability of CVM would cause I/O path to change to another available CVM using Autopath. Therefore CVM IP is not suitable. Similarly internal IP of CVM cannot be used as it is always reachable by ESXi host.
Virtual machines will be powered off in case of CVM Cluster IP is unreachable. Change from default configuration. Must be documented in operations guide.
For CVMs override the cluster settings and configure Host Isolation Response to “Leave Powered On”
When Host is isolated, CVM will have access to local storage and can continue run. When the isolation event is over, CVM will sync with other team members and avoid further delay which might happen if CVM was powered off
Overriding Leave Powered On is change from default configuration. Must be documented in operations guide