Date: Sun, 4 Nov 2012 17:48:24 -0800 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: freebsd-questions@freebsd.org Subject: Re: Questions about dump/restore to/from DVD media Message-ID: <CAOgwaMvoNCTi7AkMtjw0%2BCAaSTFHfAE5GW%2BpkMh%2B4LdR00-9rA@mail.gmail.com> In-Reply-To: <20880.1352077018@tristatelogic.com> References: <20880.1352077018@tristatelogic.com>
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On Sun, Nov 4, 2012 at 4:56 PM, Ronald F. Guilmette <rfg@tristatelogic.com>wrote: > > I would like to make a backup of one of my systems using dump(8) in order > to be sure that I get everything, including all of the obscure file > attribute > bits. > > I would like to make this backup to a _minimal_ number of DVD+R disks. > > What's the proper procedure for this? > > In the dump(8) man page, I see the following example: > > /sbin/dump -0u -L -C16 -B4589840 -P 'growisofs -Z /dev/cd0=/dev/fd/0' /u > > There are several problems with this example, as far as I am concerned. > > First I have no particular interest in, or need for _either_ an ISO 9660 > _or_ a UDF file system on my backup media. And in fact, that seems to me > as if it is likely to be an utter waste of (precious) space on the backup > media. Can't I just put the output of the dump command _directly_ onto > the output DVD+R media? If so, how would I do this? Would a command > such as the following work? > > /sbin/dump -0u -L -C16 -B4589840 -P 'dd of=/dev/acd0 bs=2048' /u > > If not, why not? (I already know for sure that I can _read_ everything > off of a DVD+R using just dd, so it seems logical that I should likewise > be able to write an entire CD using just dd, but I suspect that there may > be more to it that this, since I've never seen any references or examples > anywhere of anybody writing either CDs or DVDs using dd.) > > Actually, I just noticed in the dump manpage the -f option. So would this > work in place of the above command line? > > /sbin/dump -0u -L -C16 -B4589840 -f /dev/acd0 /u > > And if THAT works, then can dump properly sense the actual end-of-media on > /dev/acd0, so that the -B option can just be ommitted? > > Another issue is that I most definitely want to use an absolute minimum > of DVD+Rs to store the dump. So I am wondering how I might be able to > wedge gzip into this whole process. Could I do something like this? If > not, why not? > > /sbin/dump -0u -L -C16 -B4589840 -P 'gzip | dd of=/dev/acd0 bs=2048' /u > > Lastly, I want to make a backup of one entire _system_... not just one of > the several partitions that compose that system. How exactly can I do > this? I mean sure, I can back up each partition separately, using dump, > one at a time, but if I do that then the logical implication would seem > to be that on the last DVD+R used to make a backup of each of the > partitions, > there could possibly be a lot of unused/wasted space which could have been > used to store the first part of the dump for the next partition in turn. > Is there any way to effectively deal with _this_ issue? > > > Regards, > rfg > Assume one file will NOT be copied more than ONE DVD , i.e. , each file will be completely recorded on one DVD : http://en.wikipedia.org/wiki/Cutting_stock_problem Thank you very much . Mehmet Erol Sanliturk
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