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Upgrade strategy

jesusa310
Certified Lead Developer

Hi all,

 

We are upgrading Appian. We see two types of upgrade strategies:

 

1) Stop and backup the server, install a new Appian server and migrate the appian stuff from the backup. Then start the new upgraded server. Following the update guide.

2) Install a parallel server in order to ensure high availability and maintain both environments for some time. Eventually migrate the data to the upgraded server.

 

Is option 2) possible / recommended? In order to have 2 running servers per environment we might need to have 2 Appian licenses. 

 

Many thanks

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  • +1

    Hi,


    If you are upgrading to 18.3 version, there are some major changes in architecture. There is no Application server requirement. You need to check your topology before starting upgrade. Better to discuss with Appian Support for more clarity.

    Edited Response : Upgrade of one instance at a time is not supported at this time. Better to have approach to reduce down time.


    Thanks

  • 0
    Appian Employee
     in reply to Umesh Patel
    This is not correct. Please do not do this. You cannot upgrade just one node at a time.

    In terms of the original post, if your question is whether you can minimize downtime by prepping the new install before stopping the existing install, the answer is yes. But if the question is whether it's possible to do an upgrade without any downtime at all, the answer is no. Completely stopping the server and creating a full backup is a required part of the upgrade. We understand and share the desire for outageless upgrades, and it is something that we are working towards. But it is not something that is supported at this time.
Reply
  • 0
    Appian Employee
     in reply to Umesh Patel
    This is not correct. Please do not do this. You cannot upgrade just one node at a time.

    In terms of the original post, if your question is whether you can minimize downtime by prepping the new install before stopping the existing install, the answer is yes. But if the question is whether it's possible to do an upgrade without any downtime at all, the answer is no. Completely stopping the server and creating a full backup is a required part of the upgrade. We understand and share the desire for outageless upgrades, and it is something that we are working towards. But it is not something that is supported at this time.
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