Verify that your system meets the requirements to install or upgrade to the Solaris operating environment.
To install or upgrade to the Solaris operating environment, the suggested memory size is 128 Mbytes or greater.
Some optional installation features are enabled only when sufficient memory is present. For example, if you install from a DVD with insufficient memory, you install through the Solaris Web Start installation program's command-line interface, not through the Web Start graphical user interface.
When you use the Solaris 9 Installation CD and the Solaris Web Start program to upgrade, you must have a slice on the disk that does not store files. The swap slice is preferred, but you can use any slice that is not located in any of the "upgradable" root slices that are listed in /etc/vfstab. The size of this slice must be at least 512 Mbytes.