In an active/active configuration, you are running two active/passive configurations simultaneously as mirrored configurations on the same hardware.
Installation of Microsoft® SQL Server™ version 7.0 in an active/active configuration must be performed sequentially by completing the installation of the primary node first, restarting, and then performing the installation of the secondary node. The first configuration is installed as an active/passive configuration. The second configuration of SQL Server virtual server is installed in the same way but using the existing secondary node of the initial installation as the primary node and the existing primary node as the secondary node. Each instance of the SQL Server virtual server appears to be a mirror image of the other.
To install a second occurrence of a SQL Server virtual server, follow the steps outlined in How to install an active/passive configuration. Each node requires exclusive use of a logical disks set that can be shared with the remaining node for the installation. Each SQL Server virtual server needs a separate static IP address and SQL Server virtual server name. SQL Server virtual servers and shared disk resources can be allocated as needed using Cluster Administrator. For more information about configuring preferred servers, possible owners, failover, and failback parameters, see Microsoft® Cluster Server Administrator's Guide.