Triggering an HA failover?

[mbrowndcm]

Hello, How does one go about trigger an HA failover from the CLI? Specifically, how does one go about trigger a failback to the cluster member with the highest weight? Thanks, Matt

[Austin_M]

to triiger a HA failover shutdown the monitored interface from the CLI and use ha override option so that a particular cluster member always becomes the master device .

[mbrowndcm]

Thanks for your reply, Austin. What do you mean " shut down the monitored interface from the CLI" ? Do you mean the heartbeat interface? Support simply told me to run the following:

 diag sys ha reset-uptime
 

[ede_pfau]

The diag command will simply eliminate the age of the cluster members as a criterion for choosing the primary unit. To shut down an interface via CLI would mean to put it ' administratively down' . If you' re in a test environment that might work. Pulling the cable is quicker though.

[mbrowndcm]

Thanks Ede. I am not in a test environment. Therefore, I will simply use diag sys ha reset-uptime.

[Carl_Wallmark]

another way to force HA-failover is to change the priority of the slave to a higher value then the master.

[mbrowndcm]

Thanks Selective. How would I cause a fail back to the highest weighted member using this method?

[Matthijs]

 config sys ha
 set override enable
 end
 

[Carl_Wallmark]

You can type this: execute manage ha <slave number> config system ha set priority <priority number> end

[Prab]

Triggering a failover depends upon how you have configured the failover in first place. Assuming that you have the default setup. The selection is done in a sequence:

Failed Monitored interfaces > Age >Device Priority > Serial number

There are following ways to trigger the failover:

1. Resetting one of the monitored interface on the primary unit. (Unplugging the cable or administratively shutdown the interface)

2. Resetting the age of the primary unit (diagnose sys ha reset-uptime)

3. Changing the device priority (this will not trigger the failover, you still need to trigger the failover afterwards)

4. Using diagnose sys ha set-as-master enable command on an unit will make it the primary unit until it is rebooted. (Not a recommended method & not supported by all models!)

Cheers,

Prab