Re: [Dar-support] backing up directly to tape

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

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On 21/02/2015 08:28, Gour wrote:
> Denis Corbin <dar...@fr...> writes:
[...]
> 
> I did try with dar_split, but when dar filled the first tape, it
> was spitting "I/O errors" on the console while I was waiting the
> tape to rewind and replace with the 2nd one.

right, It was less than 1 hour development with very little testing, I
might consider better user interaction than just waiting 5 second to
retry, better pause and wait for user to tell dar_split to continue...
> 
> After that, dar continued with writing, but I wonder if everything
> was OK.
> 
> The problem is that I simply do not have enough space on my regular
> HD, to perform the whole backup and then try to restore and check
> if everything is OK.

You don't need to restore to check if everything is OK, just testing
the archive is enough for that: all the data reading, CRC checking,
archive layout coherence is done, just sending the read data to a
black hole in place or restoring it to filesystem.

	dar_split < /dev/tape | dar -t - --sequential-read


> 
> However, today I might try to devise a backup which fills just a
> little bit over one tape - iow. using two tapes - and then try to
> restore.
> 

[...]

> Well, using dar with tapes is just temporary solution until I
> acquire RDX which will be, I hope very soon, but, as you wrote
> above, it seems that dar is definetely more suitable for disks,
> while tapes are, maybe, better left to Amanda/Bacula/etc.

Probably yes, I don't know much other backup tools... :-)

> 
> However, I plan to deploy par2 usage 'cause it looks the price is
> not too big.

:)

> 
> 
> 
> Sincerely, Gour
> 
> 

Cheers,
Denis.
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