I should also point out like Ernie has, that if you use the bootstrapper utility to select all unix platforms and all unix ida's and selected download with or without tar file creation, the download contacts is pretty much the same as what the dvd use to be. So you could technically take the tar file and populate a subfolder on the nfs mount and this would be the same as what the Simpana 9 DVD3 was.
The bootstrap method means as Ernie said, you can select only the platforms your interested in and the iDA's you want to make the download smaller, thus quicker to obtain.
This also enables quicker delivery of enhancements to the scripts that would be part of the interactive installer, as these can now be updated and electronically available via bootstrap downloader, thus no more need to cut frequent DVD3's like in the older releases.
It has some distinct advantages.