Hi Josh!
Thanks for caring!
Am 07/19/17 um 22:58 schrieb Josh Grosse:
> On Wed, Jul 19, 2017 at 09:24:56PM +0200, Stefan Wollny wrote:
>> Hi there!
>>
>> Please excuse if this matter is not strictly OpenBSD-related even though
>> I use OpenBSD.
>
> That's OK, I happen to be the maintainer of archivers/p7zip, and also of
> sysutils/shunt, which you may want to experiment with. Way back in the
> old days when I backed up to CD and later DVD, I used shunt to split
> backups into disc-sized chunks and burn them in the backup pipeline.
> I haven't used it in years, but it should work for this purpose.
>
>> When it comes to backups one usual advice (among others) is to make use
>> of different storage types. So I have tar'ed one folder (~32GB) and
>> zip'd with p7zip. man p7 explains the '-v{size}bkmg'-switch but I got
>> "System ERROR: E_NOTIMPL".
>
> I am unable to recreate this problem on amd64. I just used
>
> $ vmctl create 100mb.file -s 100m
> $ 7z a test.7z 100mb.file -v5k
>
> I obtained 4 output files, test.7z.0001 thru test.7z.0004.
>
This is the actual command and result:
$ tar cf - /home/sw/Bilder/Nikon\ Transfer/20170430_Keukenhof/ | 7z a
-t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on -v4880m -si
Keukenhof_20170430.tar.7z
tar: Removing leading / from absolute path names in the archive
7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=de_DE.UTF-8,Utf16=on,HugeFiles=on,64 bits,4
CPUs x64)
System ERROR:
E_NOTIMPL
tar: Failed write to archive volume: 1: Broken pipe
BUT: If I do it seperately like in your example it _does_ work out fine:
$ 7z a -v4480m -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on
Keukenhof_20170430.7z Keukenhof_20170430.tar
7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=de_DE.UTF-8,Utf16=on,HugeFiles=on,64 bits,4
CPUs x64)
Scanning the drive:
1 file, 35988090880 bytes (34 GiB)
Creating archive: Keukenhof_20170430.7z
Items to compress: 1
[ ... ]
{I am aware that this is not fast but time is not an issue here.}
>> ... Using split(1) I ended with several files of
>> ~4.5GB each of which got burned to a DVD like so:
>>
>> $ doas growisofs -dvd-compat -Z /dev/rcd0c=<part-file>
>
> This is your key problem. The ISO file in "<part-file>" needs to be
> a CD9660/UFS file system when you use this form of the growisofs(1m)
> command. Instead, it contains random compressed bits. This is why you
> cannot mount it.
>
> Practice burning with DVD-RW or DVD+RW media. You can continue to play
> with it until you have your procedure correct, usable, and reproducable.
>
OK - seems I need more patience with mkhybrid-documentation...
Thanks again - I will do my best to do my homework!
Best,
STEFAN
