Installing the OpenSolaris 2009.06 release has the following restrictions:
At this time, the OpenSolaris 2009.06 installer on the Live CD is for 32-bit or 64-bit x86 platforms only. If you want to install the OpenSolaris 2009. 06 release to SPARC systems, use the automated installer tool.
See the Automated Installer Guide.
The installer cannot upgrade an existing operating system. The installer can perform an initial installation into a Solaris partition or use an entire disk. The installation overwrites all the software and data on the selected target.
However, you can upgrade all installed packages on your installed system by using the Image Packaging System. See Upgrading to the Next OpenSolaris Release.
The entire content of a preexisting Solaris partition is overwritten during the installation. Existing file systems cannot be preserved.
The OpenSolaris operating system installs a ZFS root file system, not a UFS root file system, on the disk selected during installation. The ZFS pool installed initially consists of the entire Solaris fdisk partition on the selected disk. After the initial installation is complete, you can add additional disks to this pool to create a mirrored pool configuration. For further information, see ZFS Documentation.
A maximum of 2 Tbytes on a disk or on a partition is usable for installing the OpenSolaris 2009.06 release, even if the disk or partition is larger than 2 Tbytes.