Tapeless configuration

Hi all, I'm planning to implement a TSM instance with no tape library in the short term probably medium term.

My Primary and copy pools will be on NetApp 3270 FC disk. Which can do its own sort of defragmentation - so I'm told - I'm new to NetApp.

Does anyone have any thoughts regarding performance on how to set up the pools: devt=disk or devt=file?

Does anyone have any recommendations on maximum size of volume to present to the TSM instance and I guess also on the instance itself?

Is anyone running a similar configuration?

thanks rob