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  Virtual Tape Controller
CS50 

  Disk Library Editions
CS500 DL, CS1500 DL 

Frontend ports 
2 to 4  4 to 8 
Virtual tape drives 
16 to 32 

32 to 256 
Backend ports  optional 
Physical tape drives  1 to 2  optional 
Tape volume cache capacity (uncompressed)  2.4 TB  8 TB to 1312 TB 
Sustained performance  Up to 200 MB/s  Up to 1.100 MB/s 
Virtual tape volumes  20,000  300,000 
Physical tape volumes  500  optional