NOTE: UPDATED FOR VSPHERE CLICK HERE
Advanced HA options can be set to change the way HA works.
To add advanced HA options do the following:
Open the cluster settings.
Click the "Advanced Options" in the HA section.
Enter the attribute and the value per line.
das.isolationaddress
Sets the address to ping to determine if a host is isolated from the network. If this option is not specified, the default gateway of the console network is used. This default gateway has to be some reliable address that is available, so that the host can determine if it is isolated from the network. Multiple isolation addresses (up to 10) can be specified for the cluster: das.isolationaddressX, where X = 1-10.
das.usedefaultisolationaddress
By default, HA uses the default gateway of the console network as an isolation address. This attribute specifies whether that should be used (true|false).
das.defaultfailoverhost
If this is set, HA tries to fail over hosts to the host specified by this option. This attribute is useful to utilize one host as a spare failover host, but is not recommended, because HA tries to utilize all available spare capacity among all hosts in the cluster.
If the specified host does not have enough spare capacity, HA tries to fail over the virtual machine to any other host in the cluster that has enough capacity.
das.failuredetectiontime
Changes the default failure detection time (with a default of 15000 milliseconds). This is the time period when a host has received no heartbeats from another host, that it waits before declaring the other host dead.
das.failuredetectioninverval
Changes the heartbeat interval among HA hosts. By default, this occurs every second.
das.vmMemoryMinMB
Specifies the minimum amount of memory (in megabytes) sufficient for any virtual machine in the cluster to be usable. This value is used only if the memory reservation is not specified for the virtual machine and is used for HA admission control and calculating the current failover level. If no value is specified, the default is 256MB.
das.vmCpuMinMHz
Specifies the minimum amount of CPU (in megahertz) sufficient for any virtual machine in the cluster to be usable. This value is used only if the CPU reservation is not specified for the virtual machine and is used for HA admission control and calculating the current failover level. If no value is specified, the default is 256MHz.