[Networker] SAN Backup

I have no many experience about SAN Backup. so that
what need essential element for SAN Backup ?
The next organization of san is example.

------------------------------------------------------
  |               |                 |                 |
Networker      Storage Node#1    Storage Node#2   Storage Node#3
 Server

                    -------------
                    | SAN Switch |
                    --------------

                    - Robotic
                    - drive 1      <-- Tape Library #1
                    - drive 2
                    - drive 3
                    - drive 4
                    - Slot 100


how can share drive 1,2,3,4 to four server ? what need ?
when four client can show all drive. how can use media ?
May I do individually labeling media on all server ?

also. How can i backup data when storage is changed from Tape Libary to Disk

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