We implemented a VTL 4 virtual drives using a 48Tb Sun Thumper (based on 
solaris x86) just recently.  Formerly we were running on a Sun Sparc V240.  We 
have had no problems at all.  We just moved the console server over to another 
sparc based server.  We have a storage node based on a T2000 at another site 
with tapes jukeboxes for staging onsite and cloning offsite tapes.  When we get 
to a 6tb high watermark, we have in house scripts stage off the oldest savesets 
until the virt drive is under 5tb.  I do not believe we had any issues with 
licencing from memory and it was only a few months ago.

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