* Mark Roach (mrroach@okmaybe.com) [030917 07:28]: > On Wed, 2003-09-17 at 03:03, Rogier Wolff wrote: > > On Tue, Sep 16, 2003 at 06:10:58PM -0400, Mark Roach wrote: > > > I recently acquired a dvd+rw drive for archival of a few hundred gigs of > > > document images and have been fairly disappointed with the performance > > > of the device. I have gotten a total of 7 good, 4 bad dvds from the > > > drive. It's a firewire device, I'm using growisofs as a normal user, and > > > this is the error I keep getting > > > > > > Sep 15 20:55:23 imgburner kernel: Current sr00:00: sense key Medium Error > > > Sep 15 20:55:23 imgburner kernel: Additional sense indicates Write error > > > Sep 15 20:55:24 imgburner kernel: Current sr00:00: sense key Medium Error > > > Sep 15 20:55:24 imgburner kernel: Additional sense indicates Write error > > > Sep 15 20:59:46 imgburner kernel: I/O error: dev 0b:00, sector 64 > > > > Are you using some dvd burning software and dvd+w media? My colleagues > > say that the DVD burners don't have "burnproof" when burning DVDs, so > > you hsould have your DVD image "ready" at all times. We build an image > > in a large file on a local disk before starting to burn it. > > I'm using growisofs and DVD+R media, running growisofs against a tree of > links to an nfs volume. > > > Oh, and we run the burn as root because otherwise it complains about not > > being able to increase its priority. > > I guess that would be a good thing to try. I have been trying to avoid > making the image beforehand because it increases the amount of time > required, and haven't been burning as root because the files are on an > nfs mount that squashes root, I guess I'll give both of those ideas a > try and see what happens. Thanks for the suggestion. Couldn't you use growisofs as non-root and pipe into cdrecord running as root? This will gain you the realtime scheduling, but won't protect against buffer underruns. cdrecord should tell you some stats about the fifo, though, so you should be able to tell whether you need to worry about pre-creating the image or not. Of course, since it's coming through NFS, there's always the possibility that it will just stall sometimes, Pre-creating the image is probably the best way to protect against that. Even if it usually looks okay, the process will be susceptible to failure due to transient network issues. good times, Vineet -- http://www.doorstop.net/ -- I am mortified to be told that, in the United States of America, the sale of a book can become a subject of inquiry, and of criminal inquiry too. -- President Thomas Jefferson
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