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Active/Passive HA

Can we put one of the servers in Passive node so that when one of the active nodes is down, Load Balancer automatically switch to the Passive node?
HA
user
28-12-2022 03:49:56 -0500
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4 Answers

Hi, In a Denodo production installation, it is recommended to have a backup server that will be connected to the Load Balancer when some of the main servers are not working for an unexpected reason. In the case of Active/passive architectures,i.e. two or more computers, one acts as a primary server and the second one acts as a backup in case the primary fails. When you use the Active/Passive setup (Cold BackUp setup), the Passive instance is up and running only when the Active instance fails. Please note that the Passive instance needs to be started manually and is not automatic. For more information, you could refer to the **[How to configure a VDP Backup server in the Solution Manager](https://community.denodo.com/kb/en/view/document/How%20to%20configure%20a%20VDP%20Backup%20server%20in%20the%20Solution%20Manager)** Knowledge Base article. You could also refer to the **[High Availability](https://community.denodo.com/docs/html/browse/latest/en/solution_manager/installation/postinstallation_tasks/high_availability/high_availability)** section of the Solution Manager Installation Guide for more information. Hope this helps!
Denodo Team
28-12-2022 06:18:23 -0500
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Hi, Thank you for the answer. You mentioned that in case of using Cold Backup, the Passive instance needs to be started manually and is not automatic. In case of using the Hot Backup, the Passive instance will be used automatically without manual interaction? Thank you in advance.
user
28-12-2022 06:31:36 -0500
Hi, Please note that Hot Backup and Cold Backup servers are used for disaster recovery set up in the Production **[License scenarios](https://community.denodo.com/docs/html/browse/8.0/en/solution_manager/administration/license_management/assign_licenses/assign_licenses#assign-licenses)**. * A **Hot Backup** architecture contains one or more VDP servers running and the metadata will be backed up or synchronized by the solution manager and Hot Backup server will come up **automatically** once the main server goes down. Hot Backup server would need to be configured as a passive/failover in the Load Balancer, so whenever the active Production server is down the load balancer will redirect the query to your passive HOT_BACKUP server. * A **Cold Backup** architecture contains one or more VDP servers and contains the same VDP metadata as the production servers. Once the main server goes down cold backup servers should be **manually** turned on and should be **added to the cluster**. In short, the difference between the Hot Backup and Cold backup is that the Cold backup server must remain turned off unless a failure is detected on any of the Production servers. When one of the Production VDP servers fails, the Cold backup servers should be manually turned on and added to the cluster. Also, the Cold Backup Servers will be used only for the Disaster Recovery scenarios. Whereas the Hot Backup has one or more servers and the servers will be running at all times. If one of the Production servers fails, then a request will always be sent to Load Balancer and Load Balancer will decide whether to send that request to Production server or hot backup depending on its health status. Hope this helps!
Denodo Team
28-12-2022 07:03:00 -0500
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Yes it is very informative. Thank you for your support and quick response.
user
28-12-2022 07:15:24 -0500
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