George,

On 26/03/2010, at 04:33 , George Sinclair wrote:

> Kind of a dumb question here ...
> 
> 1. I notice that when I go to clone a save set that the source tape will 
> forward a certain number of files (e.g. 173) and then read, with the target 
> tape moving forward and then writing - all well and fine.
> 
> 2. But if I then clone another save set on the same source tape, and this is 
> just a few file beyond the previous one (e.g. 177), it again forwards that 
> number of files (in this case 177). It appears that after each clone, the 
> source tape rewinds??
> 
> Is this correct behavior on non-rewind devices? Perhaps, the non-rewind only 
> applies when writing data and not reading data?
> 
> 3. I then run another clone wherein I give it a list of all the ssids on the 
> source tape, and it simply reads solid all the way through and does not 
> mention anything about forwarding or rewinding. It just reads uninterrupted. 
> Does this make sense?

NetWorker rewinds the tape to make sure that it's writing to the correct tape; 
I also believe part of the other purpose is that when it's finished writing it 
will write a double-EOF to signify current end of tape. When it's time to start 
writing again, it goes back and writes over the _second_ end of tape so that 
there's just a plain EOF marker between the two savesets. That behaviour was 
explained to me over a decade ago though so apply standard caveats to it :-)

Cheers,

Preston.

--
Preston de Guise

http://nsrd.info/blog                           NetWorker Blog
http://www.enterprisesystemsbackup.com          "Enterprise Systems Backup and 
Recovery: A corporate insurance policy"





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