The following illustration shows a completed GAD system configuration, which includes the following key components:
- Host server connected to the primary and secondary storage systems with management software (multi-path or cluster or both, depending on the system configuration).
- Primary and secondary storage systems at the primary and secondary sites. The following system components are configured on the storage systems:
- The volumes that will become the primary and secondary volumes of GAD pairs
- The GAD feature installed on the primary and secondary storage systems
- A virtual storage machine on the secondary storage system. Virtual storage machines can be configured on both the primary and secondary storage systems, but in this sample system configuration only the secondary storage system has a virtual storage machine.
- A resource group on the secondary storage system. Resource groups can be configured on both the primary and secondary storage systems, but in this sample configuration only the secondary storage system has a resource group.
- An external volume group on each storage system for the quorum disk
- Remote paths between the storage systems
- A CCI command device on each storage system
- External storage system with the quorum disk connected to both storage systems using Universal Volume Manager
When you configure a GAD system, there are two procedures: VSM auto-configuration and VSM manual configuration. For details, see Creating GAD pairs.
System configuration in VSM auto-configuration
System configuration in VSM manual configuration