It depends on what "this" you meant, but in general the ways of netbooting an OS are many and varied. You'd have to declare what kind of root device you ultimately want, such as root on iSCSI.
Personally, I feel that "smartOS does not support booting from a local block device like a normal, sane operating system" might be a drawback and is a peculiar thing to brag about.
Personally, I feel that "smartOS does not support booting from a local block device like a normal, sane operating system" might be a drawback and is a peculiar thing to brag about.