How to reduce failover time where for an appliance in standby mode in CMS/GTO?

A standby appliance is guaranteed to activate 10 - 15 minutes after all designated GTO appliances lose communication with the Standby appliance. To reduce the failover time, we need to add a CEM value.

When the ACTIVE SMA Appliance is undergoing maintenance by the CMS (such as for a configuration change, hotfix

installation, or firmware upgrade), and user connections cannot be serviced, the standby appliance will be automatically activated.

Note: Refer CMS GTO Admin guide for more details.

https://www.sonicwall.com/support/technical-documentation/?language=English&category=Secure%20Remote%20Access&product=SMA%201000%20Series&resources=Administration%20Guide&version=12.3 

We need to apply the CEM value on CMS and appliances under the GTO service.

Take a backup of the settings file before making any changes

1-  Log in to AMC.

2-  Click on Maintenance in the left-hand navigation menu. (In case of CMS, Management server-> maintain)

3-  In the URL, append "?advanced=1", and hit return.

4-  Click on Configure under the new section Configuration extensions.

5-  Click New

6-  For the Key field, put in: MGMT_STANDBY_APPLIANCE_ACTIVATION_MINUTES

7-  For the Value field, put in: 5

8-  Click OK.

9-  Click Save,

10- Apply Changes (this will force an apply-all, making the changes take effect).

NOTE: The value field represents the time in minutes

WARNING: Validation is not performed on the Key/Value pair input values, so any wrong inputs on these fields could break your system. CEM values are Case sensitive.

Important: With the CEM value the Standby device becomes active immediately on detecting a loss of connectivity and will accept new connections made to the GTO service name but this also depends on the DNS delegation.

Note: Refer CMS/GTO Admin guide for more details.