Check out the new OpenSolaris page and download the new OpenSolaris binary distribution.
You can easily download the integrated MySQL packages by using the Package Manager GUI or simply
pkg install SUNWmysql5
As part of the MySQL packages the MySQL Cluster (NDB) storage engine and management binaries are included. You can use the general documentation available at MySQL.comfor setting up a Cluster . Then you should be ready for high availability MySQL.