A high-availability (HA) cluster consists of a primary HA host, a secondary HA host, and cluster virtual IP address.
You must purchase a separate HA license to set up high availability. However, the license should not be allocated to the secondary console or the secondary managed host.
Primary HA Host
The primary HA host is any console or managed host in your JSA deployment that requires protection from data loss if there is a failure.
When you create an HA cluster, the IP address of the primary HA host is automatically reassigned to a cluster virtual IP address. Therefore, you must assign an unused IP address to the primary HA host.
When you create an HA cluster, the original host name of your primary HA host becomes the virtual hostname for the HA cluster, and "-primary" is appended to the host name of your primary HA host. You can't change the host name of a host in an HA cluster.
The primary HA host can act as a standby system for the secondary HA host. For example, if the primary HA host is repaired after a failover, the status changes to standby.
Secondary HA Host
The secondary HA host is the standby system for the primary HA host.
If the primary HA host fails, the secondary HA host automatically takes over all the responsibilities of the primary HA host.
When you create an HA cluster, the host name of your secondary HA host is changed to <cluster_host_name>-secondary. You can’t change the host name of a host in an HA cluster.
Virtual IP Address
When you create an HA cluster, the cluster virtual IP address takes the IP address of the primary HA host.
Configuring the Cluster
Use the HA wizard to configure the primary host, secondary host, and cluster virtual IP address.
The following items are validated when you configure by using the HA wizard:
The secondary HA host is not part of another HA cluster.
The software versions on the primary and secondary HA hosts are the same.
If the primary HA host is configured with an external storage device, the secondary HA host is configured to access the same external storage device.
The primary and secondary HA hosts support the same Device Support Module (DSM), scanner, and protocol RPMs.