On Mon, Feb 05, 2007 at 05:09:09PM -0500, Josh Grosse wrote:
> I have a small network with a central backup server; backup has been to
> hard drive, compressed.
>
> I have begun experimenting with using dump(8) to split partitions in to
> manageable units for burning onto DVD+RW.
>
> I am posting to see if anyone else is using dump with optical media; I'm
> interested in finding out whether there is a better way than how I am
> currently accomplishing it.
>
> -----
>
> I have been using ISO9660, and carving each DVD+RW disc into 2 logical dump
> volumes to get past ISO9660 filesize limitations. I've also been using a
> hard
> drive as temporary storage. And I have been using 32kb blocksizes, since that
> is what growisofs uses. For example:
>
> dump -0B 2294928 -b 32 -f file1,file2,file3,... /path/to/backups
> growisofs -Z /dev/rcd0c -r file1 file2
> growisofs -Z /dev/rcd0c -r file3 file4
> growisofs -Z /dev/rcd0c -r file5 ...
>
> I have yet to figure out how to burn dump volumes directly to the disc without
> a filesystem, and then *cleanly* restore. For example:
>
> dump -0B 4590208 -b 2 -f /dev/rcd0c /path/to/backups
>
> In addition, I have been forced to use hard drive as working space. I have
> not been able to get named pipes working with dump, and it will not split
> std output into volumes.
>
> Does anyone have a better way?
ISTR that there was a piece of software called 'shunt' that would pipe a
specified amount of data into certain commands, then close and re-open
the pipe. This is basically what split does, but writing to a pipe
instead of files.
Otherwise, try:
#!/bin/sh
dump ... | {
i=0;
while dd bs=$BIGNUM count=$BIGNUM2 | \
mkisofs -stream-media-size $SIZE ... | \
cdrecord ...; do
echo "Burned CD $i - press return to continue";
read </dev/tty;
i=$((i+1))
done
}
Or some variant on the above that actually works (dd might or might not
be necessary, for example).
You'd have to try a couple shells to figure out whether you can get by
with /bin/sh, or if you really need ksh.
Of course, the only way to restore is piping all STREAM.IMG on all those
DVDs into a similar script.
Joachim
