How to set up set up master-slave author set up

Question

Hi - In my organization, we are planning to set up AEM6.5. AEM 6.5 is already installed on servers A and B and application is running on both the VM's. Currently live traffic is not yet established.

I need to know how to set up author in a Master-slave mode.

1) In general only A author will be running all time and in case of any author corruption, we need the standby "B author" to be able to handle live request immediately without any manual intervention.

2) Also need to know how to set up A and B in sync mode..i.e..imagine i do a change in A server and same change should get auto reflected in B servers as well..

I have tried reviewing many articles over forum but nothing really answered it, please clarify!!!

aemmarc2 · Accepted Answer

we need the standby "B author" to be able to handle live request immediately without any manual intervention.

It doesn't work like this. The standby isn't meant as an immediate fail-over per-se. The purpose of the standby instances is to guarantee a live data copy of the master repository and ensure a quick switch without data loss in case the master is unavailable for any reason. It's not instant and it 100% requires manual intervention to get the Standby started as a new Primary. [1]

Also -- you'll need to be very familiar with re-building a standby instance from scratch when you apply any major update to the primary Author. [2]

TLDR; Cold-Standby is likely not what you think it is.

[1] -- https://docs.adobe.com/content/help/en/experience-manager-65/deploying/deploying/tarmk-cold-standby.html#failover-procedures

[2] -- https://docs.adobe.com/content/help/en/experience-manager-65/deploying/deploying/tarmk-cold-standby.html#applying-hotfixes-to-a-cold-standby-setup

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