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The only thing I can think of is that the SAN option communicates with other Backup Exec Servers that may be writing to the same SAN to make things more efficient and to prevent two servers from overwriting data another one just placed there. Same thing with the tape library.
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The only thing I can think of is that the SAN option communicates with other Backup Exec Servers that may be writing to the same SAN to make things more efficient and to prevent two servers from overwriting data another one just placed there. Same thing with the tape library.

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Backup Exec 11d Best Practices Guide: SAN Shared Storage Option <br />
<a href="http://support.veritas.com/docs/285771" rel="ugc">http://support.veritas.com/docs/285771</a>&nbsp;
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Backup Exec 11d Best Practices Guide: SAN Shared Storage Option
http://support.veritas.com/docs/285771 [http://support.veritas.com/docs/285771] 

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You will need the library option license to enable the second drive in your library but as iam' says SSO is only for multiple media server to share libraries. CASO is normally used in conjunction with SSO but you don't ned either.
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You will need the library option license to enable the second drive in your library but as iam' says SSO is only for multiple media server to share libraries. CASO is normally used in conjunction with SSO but you don't ned either.

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We are putting together a new backup system that involves a BUExec server, 2 tape drives, a tape library, and a SAN. &nbsp;They will all be connected via a fiber channel switch. &nbsp;If the BUExec server can see all these devices why would I need the SAN or Tape Library options for BUExec 11d? &nbsp;What would they add to BUExec that I might need?
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We are putting together a new backup system that involves a BUExec server, 2 tape drives, a tape library, and a SAN.  They will all be connected via a fiber channel switch.  If the BUExec server can see all these devices why would I need the SAN or Tape Library options for BUExec 11d?  What would they add to BUExec that I might need?

Explain Why I might need SAN option for Backup Exec 11d?

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.