This is useful if you want to utilize one host as a spare failover host, but is not usually recommended, because HA tries to utilize all available spare capacity among all hosts in the cluster.

das.defaultfailoverhost вЂ“ If this is set, HA will first try to fail over hosts to the host specified by this option.

das.isolationShutdownTimeout вЂ“ The amount of time that HA waits to gracefully shutdown a VM if the вЂњShutdown VMвЂќ option is selected for isolation response.

If you are using the das.isolationaddress setting then this should be set to false. This attribute specifies whether that should be used or not, the values are true or false.

das.usedefaultisolationaddress вЂ“ By default, HA uses the default gateway of the console network as an isolation address.

In general the more isolation response addresses configured, the longer you should make the timeout to ensure that proper failure detection can occur. If you use this setting you should change the default failure detection time (das.failuredetectiontime ) to 20 seconds or greater. You can have a total of 10 isolation addresses set using the following format das.isolationaddressX, where X is a number 1-10. There may be situations in which a single isolation address would indicate that a host is in a state of complete isolation from the network, but access to additional isolation addresses would show that only a partial network failure has occurred. Using multiple isolation response addresses gives HA a potentially more accurate picture of the network connectivity of a host. This default gateway has to be some reliable address that is known to be available, so that the host can determine if it is isolated from the network. If this option is not specified, the default gateway of the console network is used.

das.isolationaddress вЂ“ This setting was introduced in VirtualCenter 2.0.2 and is the IP address that HA will ping to determine if a host is isolated from the network.

Setting this to false leaves the virtual machine still running on the isolated host when an HA event occurs. The default is true which powers off virtual machines in case of an HA event.

das.poweroffonisolation вЂ“ This setting is the default cluster setting for virtual machine isolation response that is set through the VI Client.

For example if you wanted to increase this to 60 seconds you would set it to 60000 milliseconds (donвЂ™t use commas in the number).

This setting is in milliseconds and can be changed from the default of 15000 milliseconds. Previously this was hard-coded so that if a host did not respond in 15 seconds then it would be considered failed. das.failuredetectiontime вЂ“ This setting was introduced in VirtualCenter 2.0.2 to allow the default interval for HA detection to be changed.

Vcenter 6.5 ha options