when purchash tape library.
what should be my concern?

I don't know anything about that, so please give detail.

1.
I heard something from DLT,AIT or LTO.
does that all work with Oracle, does oracle backup
needs something special?

2. it is sun box, does that need something special?

3.
does all software like Legato networker or Veritas Netbackup
works fine with oracle, sun?

does hardware come with those software or i need to
purchase those software as well?