If you are referring to using an XSan media server setup with Premiere, the best information I have
came from from Mitch Wood, Senior Solutions Engineer at Adobe Systems on 7/14/11.
"The bad news is that our XSan testing has been pretty limited. Most of the information that we know about it has come indirectly from customers. In short, it works with Premiere Pro. I'm certain that there are some caveats around configuration and usage (as there is with any network storage), but the details of that are largely unknown. The good news is that next week we'll be installing an XSan in our compatibility lab so we'll have much better information about its use soon. We have some very large customers that need to use their existing XSan storage with Premiere Pro, so we are definitely motivated to make sure it's compatible. So much so, that we intend to demonstrate a Premiere Pro / XSan workflow at IBC this year.
The bottom line is this - although we don't know much detail about XSan and Premiere Pro integration now, we will shortly and it's our intention to make certain that it works well."
Adobe Senior Solutions Engineer
Much more information about making the transition from Final Cut Pro or Avid Media Composer
to Premiere Pro can be found here: