Parchive building

Hi,

Have anyone done some statistics on the time it takes to create data
protection parchive on each single slice or the whole dar backup? I mean,
I know the created parchive size would be not much different in size, but
how about the creating time?

The reason that I'm asking is that, according to the defect theory, the
defects will mostly likely to happen in concentrated places, instead of
spreading evenly throughout the whole thing, which would be most unlikely to
happen.

So, for a 100 slices backup of 10M each, the maximum error the current
approach can tolerate is 200K in each slice. But if the parchive is created
over the whole dar archive, like what the usenet posting is doing, then the
maximum error a single slice can tolerate is much more than that. When
defect or scratches happens to CD/DVD backup media, mostly likely, half 
of a slice will be gone. If we create parchive over the whole dar archive,
in example I just gave, we can still do a full recovery even if the two
whole slices are gone.

Comments?

-- 
Tong (remove underscore(s) to reply)
  http://xpt.sourceforge.net/



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