Antonio Lobato wrote: > > > Hello! > > > Im writting backups to dvd rw with the command line: > > createfilelist.sh | cpio -o | mkisofs -stream-media-size <N> | > growisofs -Z /dev/scd0=/dev/fd/0 > > If I use N = 333000, It burns the cd normaly so I can mount it on > linux or read it from windows later. But, If I use bigger numbers, like > 2295104 (the real sectors number of my 4.7GB media), it burns without > error messages but when I try t omount it on linux: > > # mount /dev/scd0 /mnt/dvd/ > mount: not a directory > > > Some hint? > > (growisofs 5.11, mkisofs 2.01, linux 2.4.20) > > PS: Im fully sure that /mnt/dvd exists and can be mounted on. The > trouble really just arises when N is 2295104.
The problem is that streaming data into mkisofs forces it to put the directory structure at the end of the burn because it does not know how large the file it is creating will be until it consumes the entire pipe, and the size of the file is one of the things the directory structure holds.
The error you are seeing is because linux kernels prior to 2.6.8.1 have an inode scheme that wraps around at 4 GB. So, if you tell mkisofs to put the directory structure at 4.1 GB, linux looks at the block at 0.1 GB instead of the one at 4.1 GB. Unsurprisingly, linux cannot find the directory structure at 0.1 GB. Kernels after 2.6.8.1 wrap at 128 GB which solves the problem for the current and (probably) next several generations of media.
Also, as Thomas has already mentioned, there are probably still problems using mkisofs to fill an entire DVD. (I haven't been keeping up though.) I wrote the 2.6.8.1 kernel patch because I wanted to do exactly what you are trying: I wanted to stream backups to my DVD drive like it was a tape drive. I think I have worked through all of the gotchas including how to span one large backup across multiple DVDs. You can find my solution at the following URL:
http://www.serice.net/shunt/
Paul Serice
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