On 01/03/12 04:23, Erich Weiler wrote:

> The fileset I'm backing up is about 200TB large total (each file is 
> about 300GB big).  So, not only will it use every tape in the tape 
> library (41 tapes), but we'll have to refill the tape library about 6 
> times to get the whole thing backed up. 

And if _anything_ goes wrong you'll have to start over - for a run time
of around 21 days assuming best speed.

Break the job up into smaller sets. We try to use maximum units of 1Tb.

> After that I want to just do 
> incrementals against the initial Full Backup; the files will never 
> change, they will just be added to as time moves on.  

You will still want periodic fulls or synthetic fulls.

Only having 1 backup is asking for trouble, especially if there are
hundreds of subsequent incrementals to spool through too.

That's why GFS (grandfather-father-son) backup strategies were developed
- there are always at least 2 full backups available in case one set
goes bad.

> So, I guess a have a couple basic questions.  When it uses all the tapes 
> in the library in a single job (200TB! 41 tapes only hold 60TB), will it 
> simply pause, send me an email saying it's waiting for new media, then I 
> load 41 new tapes?  Then tell it to resume, and it uses the next 41, ad 
> nauseum?

Yes

> And, if I want to make 2 copies of the tapes, can I simply configure 2 
> differently named jobs that each backup the same fileset?

Yes. If you have multiple tape drives you can also copy between tapes.

> Also, do I need to manually "label" the tapes (electronically) as I load 
> them, or will the fact that the autoloader automatically reads the new 
> barcodes be enough?

look up the "label barcodes" directive.




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