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1. Stop XperienCentral on all read-only nodes.
2. Stop XperienCentral on the read/write node(s).

3. Upgrade XperienCentral first on one of the read/write node(s) and after successfully starting XperienCentral on that node, upgrade the remaining read/write and read-only nodes.

4. See Upgrade Notes per Version for further tasks (if any) that you need to perform for the newly installed version of XperienCentral.

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 Environments Using the File Distribution Service

1. Start XperienCentral on a read/write node with the setting
   
   -Dwebmanager.clustering.filestore=false.
   
   XperienCentral is completely started when the following messages appears in the Tomcat log:
   

   <date><time>.gx.webmanager.startup.impl.Startup start
INFO: XperienCentral started successfully in x ms



2. When you have determined that the upgrade was successful, stop the read/write node.

3. On the read/write node that you started and confirmed that the upgrade was successful in the steps above, change the setting clustering.filestore to true
   (-Dwebmanager.clustering.filestore=true).

4. Start XperienCentral on that read/write node.
   
   After the read/write node is started, the file store will be initialized by the File Distribution Service (files from the upload and upload_mm directories). Depending on the number of/size of files on the website, this process could take some time. During this process, the node is available for use but could be slower due to the impact from the file synchronization process. Editors should be able to continue working. The following message appears in the log when the File Distribution Service has completed its task:

   INFO: Finished scanning the web roots for files for the File Distribution Service



5. Start XperienCentral on the second read/write noder if you are running a dual read/write node environment. Wait until the second read/write node has started successfully before starting XperienCentral on all read-only nodes. This could also take some time because the second read/write node needs to synchronize files from the central file store to the local disk. Until the file synchronization process is complete, the second read/write node will not be available for use.

6. In a single read/write node environment, start XperienCentral on all read-only nodes.

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Environments that Do Not Use the File Distribution Service

1. Start XperienCentral on the read/write node. XperienCentral is completely started when the following messages appears in the Tomcat log
   
   <date><time> nl.gx.webmanager.startup.impl.Startup start
INFO: XperienCentral started successfully in x ms
   
   
2. Confirm that the upgrade was successful.
3. Start XperienCentral on all read-only nodes.

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