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Barracuda Email Security Gateway Clustering Support !

#Barracuda #ESG #Clustering

Best Answer Michelle Exner, 06 January 2020 - 12:03 PM

Clustering only does three things

1. It copies configuration changes to all units in the cluster
2. It allows you to see the message log as one complete log for all units in the cluster
3. If you are using quarantine it keeps a copy of the users quarantined messages on two different units in the cluster.

If mail is being processed on one unit and it dies then the session fails. The sender should see that as a deferral and should retry the mail at which point it should hit another unit in the cluster.

Clustering is not a failover service. All units in the cluster should accept and process mail as an individual unit. They do not share resources.

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#1 Mikel

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Posted 06 January 2020 - 05:32 AM

Hi bros, i just wonder what will happen in a special case:
Assuming that i have 2 Barracuda that are clustered with each other (ESG-1 and ESG-2)
Let's assume that an email is being processed by ESG-1, for example AntiVirus, Spam Score rating ....
So what will happen if during this process, the ESG-1 is down? Does Barracuda ESG Clustering has feature that support to transfer the ongoing session to another cluster member and continue to process the email (Something like Microsoft Exchange Shadow Redundancy Feature)?
Or the Client has to re-send a message ?

 

Note that we only care about the ongoing email at the time of ESG-1 down, after that moment, it's sure that all the upcoming email message will be directed to the ESG-2 (using Load Balancer or DNS MX Records)
Many thanks for your help.   :)



#2 Michelle Exner

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Posted 06 January 2020 - 12:03 PM   Best Answer

Clustering only does three things

1. It copies configuration changes to all units in the cluster
2. It allows you to see the message log as one complete log for all units in the cluster
3. If you are using quarantine it keeps a copy of the users quarantined messages on two different units in the cluster.

If mail is being processed on one unit and it dies then the session fails. The sender should see that as a deferral and should retry the mail at which point it should hit another unit in the cluster.

Clustering is not a failover service. All units in the cluster should accept and process mail as an individual unit. They do not share resources.


Michelle Exner
Product Lead Support Engineer
Barracuda Email Security
(408) 342-5300


#3 Mikel

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Posted 06 January 2020 - 09:26 PM

Hi Michelle
Thank you for your great explanation bro.