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Update Gateways from R77.30 to R80.20 (ClusterXL)

Hi - I have 2 ClusterXL (based on 12000 series appliances), currently running a R77.30 GAIA OS image version.

Our SMS is already running R80; I would like to upgrade the ClusterXL Instances from R77.30 to R80.20, possibly without any loss of traffic (that is, starting by updating the standby member of each ClusterXL, then switching the Active role to the already updated node, and updating the cluster member still running the R77.30 GAIA OS Image). 

Is it possible to perform such Update without any loss of traffic ? Or should I rather schedule a dedicated maintenance window ?

Moreover, could you please suggest / provide description to links / docs / videos describing the update Procedure ?

Thanks in advance.

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