Ray Todd Stevens wrote:
> Interesting.   First the tar thing definitely did not work. 

Can you write a tar tape directly to the device and read it back?  Tar 
normally writes (and reads) in 10k blocks and many tape devices are 
sensitive to the block size in that accesses must match or be an exact 
multiple of the block size set with 'mt' and the read size must match 
the size of the write for the same data.   I don't think backuppc deals 
with blocking at all, so if you need it and have intermediate space you 
might write to a file instead, then later copy it to tape with dd using 
obs=10k as an option.  Or just generate the tar image with the command 
line tool BackupPC_tarCreate and pipe through dd to get the obs=10k 
option as you write to tape.

> Second it sure might be good to have this in the documentation.

It is very much operating system and hardware dependent.

> It might be even cooler to 
> have a restore from tape function as a part of the application.

Most of the point of making an archive in tar format is that you don't 
need a special application to restore it.  Any copy of tar should be 
able to extract the files.  If you have backuppc running, most of the 
time you would want to restore directly from its disk copy.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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