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Yeah, this has been an issue for a while now. Writing to tape is a bit different than writing to disk. The data flow is more of a stream rather than bursty blocks. If the data stream to the tape is broken, the tape usually has to reposition itself back over the tape head to continue. If a path fails, the session between the tape drive and the writing host is lost and you have to restart the job. That's why most backup engines show status of all jobs going to tape in near real-time.
I know most of the enterprise class backup software solutions will allow you
to automatically failover a job to another media server if your primary
media server goes away but the job is usually restarted from scratch. Although a solution may now exist that allows path failover of existing backup jobs, I am not personally familiar with one. Perhaps W. Curtis Preston, the backup expert on this site, can shed more light on this subject!
Chris
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