Review the following requirements for VCS campus clusters:
You must install VCS.
You must have a single VCS cluster with at least one node in each of the two sites, where the sites are separated by a physical distance of no more than 80 kilometers. When the sites are separated more than 80 kilometers, you can run Global Cluster Option (GCO) configuration.
You must have redundant network connections between nodes. All paths to storage must also be redundant.
Veritas recommends the following in a campus cluster setup:
A common cross-site physical infrastructure for storage and LLT private networks.
Veritas recommends a common cross-site physical infrastructure for storage and LLT private networks
Technologies such as Dense Wavelength Division Multiplexing (DWDM) for network and I/O traffic across sites. Use redundant links to minimize the impact of network failure.
You must install Veritas Volume Manager with the FMR license and the Site Awareness license.
Veritas recommends that you configure I/O fencing to prevent data corruption in the event of link failures.
See the Cluster Server Configuration and Upgrade Guide for more details.
You must configure storage to meet site-based allocation and site-consistency requirements for VxVM.
All the nodes in the site must be tagged with the appropriate VxVM site names.
All the disks must be tagged with the appropriate VxVM site names.
The VxVM site names of both the sites in the campus cluster must be added to the disk groups.
The allsites attribute for each volume in the disk group must be set to on. (By default, the value is set to on.)
The siteconsistent attribute for the disk groups must be set to on.