Upgrading to a fix pack with no downtime
You can upgrade to a fix pack from the 6.0 version in a two or more DC setup without downtime by completing some manual tasks.
Before you begin
Identify the data center that has the initial node. Identify also the initial node. Some steps must be completed on the initial node first or you might have unwanted downtime.
About this task
The upgrade occurs in the following phases:
- Backup and preparation
- Update the prerequisites - Cassandra and ZooKeeper
- Update B2B and Global Mailbox
Each phase must be completed carefully to avoid downtime.
Do not stop all servers at once. Stop only the servers that are required for the specific tasks. When the upgrade is completed successfully, file uploads and file processing can occur during this upgrade, because the required consistency level for Cassandra or quorum for ZooKeeper is not lost.
To upgrade your environment, complete the following tasks: