Step1: Backup your gateways now
Step2: Install ccc on your gateways to check what IP your SMS had and what the security policy‘s name was, VPN gateways IP addresses, VPN topology, interface topology and much more
Step3: Set up a new SMS VM with the same IP it had before
Step4: Create a cluster object with the two cluster nodes that you have
Step5: Establish SIC to the new SMS using this procedure.
Step6: Read in the entire cluster topology
Step7: Recreate the rules using the $FWDIR/state/local/FW1/local.rule file on your gateways.
Step8: Install the new security policy
Step9: Check if everything is fine. In case it‘s not, restore the backup from Step1 and rework your security policy before trying again from Step5