Software like Veritas and Legato are often used in conjunction with RMAN for your Oracle backups. Oracle Corporation has worked closely with Veritas and Legato to help ensure that these products integrate with RMAN very nicely. So why would you want to use these products?
Oracle Corp. has very little interest in designing interfaces to tape devices, and I cannot blame them. This is where Veritas and Legato come in. Many companies are already using Veritas or Legato for backups of their Unix servers, etc. Many times, these backups are written to an automated tape library system so that a human does not have to mount tapes for the backup. RMAN does not have the ability to write to these automated tape libraries directly. Therefore, you need a middleman, like Veritas or Legato.
This was first published in January 2006