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Chapter 12. High availability and redundancy 307
12.3 Active/Passive High Availability: Configuration
planning
You need to plan the setup of SDMC High Availability, and there are several
considerations and issues to be aware of in setting up and administrating this
environment:
򐂰 Both SDMCs must be at the same code level prior to the High Availability
configuration.
򐂰 SSH must not be blocked by the firewall during the initial High Availability
configuration.
򐂰 Data on the secondary node is lost during the High Availability configuration.
򐂰 Data on the primary node, where the High Availability configuration is
triggered, is retained and mirrored to the secondary node.
򐂰 Both SDMCs must be turned on at all times to receive the benefits of high
availability.
򐂰 Only the active SDMC console can be accessed after High Availability is
configured.
Note: Prior to the High Availability configuration, backups of both SDMC
images should be taken so that the SDMCs can revert back to their original
non-High Availability states should there be problems during the High
Availability setup or if you want to go back to a non-High Availability setup.