LTO 3 Virtual Tape with maximum size 200GB
Is it any issue/problem for netbackup to backup to LTO 3 Virtual tape, but on VTL we create maximum size = 200GB for LTO3 Virtual Tape?
Why we set the size max 200GB for the virtual tape on our VTL...
The over subscription issue where a virtual cartridge can't fit on a physical tape is well known. Some vendors claim to use same compression algorithm code as the LTO tape drive thereby guaranteeing a 1:1 relationship. Other vendors take another approach and here you need to ensure the 1:1 relationship by by making the virtual tape smaller. This is no problem from a technical perspective. Netbackup will write data to a tape until the drive return a "EOM" - End of Media. If this message is returned at 200GB 400GB or 1600GB - Netbackup don't care.
From a cost perspective you need to keep in mind how much tape capacity you loose by under subscribing physical tapes.
