Re: [Dar-support] Determining correct slice

[Denis C. <dar...@fr...>]

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Gene Horodecki wrote:
>[...]

> Thank you for your prompt reply.  I just did some testing... Actually on 
> a largish directory and it worked wonderfully.  I was able to restore a 
> subset of this directory nicely.

> Except.. something strange happened. 

> This backup set is in 16 slices across 4 DVDs.  My directory existed in 
> slices 6-10 which were on DVDs 2 and 3 in the set.  However, dar still 
> asked for the first and last slice which means I still needed DVD 1 and 
> DVD 4.  So in other words, even though my restore was from 2 DVDs I 
> needed all four in the set!

> Is there any way to prevent this?  I would expect to only need two DVDs 
> if that is where my files are.  Perhaps it is something to do with the 
> way I backed the files up?  The command I use is:

This is normal. At the end of the archive dar puts the table of contents
of the archive. This information cannot be complete before the archive
is finished, so the only possible place for the archive contents is the
end, and you need the last slice to get it.

The first slice contains some important information too about the
slicing (first slice may be of different size, and last slice may not be
exactly full), thus dar needs to read the beginning of first slice. This
design has been improved and this information has been moved at the end
of the archive, thus with the next major release dar will only require
the last slice to be able know the contents and where to locate files
inside the archive.

A workaround would is to burn the first slice on the same disk as the
last slice, you can even choose a very small size (~ 100 bytes) for it
thus calling dar this way: dar -c <archive> -s 1G -S 100 ...
would let you keep the first slice on the last disk with very little
penalty.


> dar -c /mnt/secondary/dar/bYYYYMMDD -z -R 
> /mnt/mirror/shares/downloads/available -s 1024M -S (1Gb - size of last 
> slice)

> Thanks again!


You're welcome!

Regards,
Denis.
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