We use ufsdump to backup our file systems to 8 mm, 4mm or DAT 72 tape drives. 
The default blocking factor ufsdump uses is 64 (without b or c option) and the 
problem with this is the amount of data that can fit on a tape because of the 
IRG.

My questions are:

- how can I find out the optimum blocking factor (or that is supported) for 
each tape device (8mm/4mm/DAT72)?
- what are the issues of changing the blocking factor to 512 (ufsdump code 
seems to cap the blocking factor to 512)?

Thanks in advance.
-- prasad
 
 
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