As you plan your HA pair, you must consider recommended best practices, the requirements, and the possible variations.
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Best practices for
HA pairs
To help your HA pair to be robust and operational, you must be familiar with configuration best practices.
Setup requirements and restrictions for standard HA pairs
You must follow certain requirements and restrictions when setting up a new standard HA pair. These requirements help provide the data availability benefits of the HA pair design.
Requirements for hardware-assisted takeover
The hardware-assisted takeover feature is available on systems where the Service Processor module is configured for remote management. Remote management provides remote platform management capabilities, including remote access, monitoring, troubleshooting, logging, and alerting features.
If your cluster consists of a single HA pair
Cluster high availability (HA) is activated automatically when you enable storage failover on clusters that consist of two nodes, and you should be aware that automatic giveback is enabled by default. On clusters that consist of more than two nodes, automatic giveback is disabled by default, and cluster HA is disabled automatically.
Storage configuration variations for HA pairs
Because your storage management and performance requirements can vary, you can configure HA pairs symmetrically, asymmetrically, as an active/passive pair, or with shared disk shelf stacks.
HA pairs and storage system model types
Different model storage systems support different HA configurations. This includes the physical configuration of the HA pair and the manner in which the system recognizes that it is in an HA pair.