I have observed similar results using LTO-1.

180GB, ten streams, going to two tape drives on the same media server. I 
set MPX to 5 so it would use two drives.   The whole backup job finished 
in less than 90 minutes.  I did a restore to a different sun client, and 
selected all but about 700MB of OS files, and it took under 90 minutes 
to put it back.  NB loaded both tapes, and put the data back in what 
appeared to be one pass of the tapes. 

I have also observed that a multi-streamed backup is much quicker at 
finding files on tape, especially if the whole backup job includes 
millions of files and hundreds of gigabytes.  While watching the logs, I 
saw it request a tape to be positioned to a specific file instead of 
scanning the tape sequentially and searching for the few files you need 
restored.

-Jon

>  
>


> I got a 300GB file system to backup. I split it to four streams, and 
> multiplexing them to a single IBM LTO-2 tape drive.
>
>  
>
> 1^st stream is 53GB finished in 2 hrs.
>
> 2^nd stream is 53GB finished in 2hrs.
>
> 3^rd stream is 80GB finished in 3hrs.
>
> 4^th stream is 120GB finished in 4hrs.
>
>  
>
> However, when I did a full restore, it only took 2 hours.
>
>  
>
> Does anybody have experience restore faster than backup?
>
>  
>
> /Daniel Chan/
>
> Senior Engineer
>
>
> Tel: 703-948-3428
>
> Fax: 703-421-9124
>
> danchan AT verisign DOT com <mailto:danchan AT verisign DOT com>
>
>  
>