Interesting. On Fri, 17 May 2002, Vagn Scott wrote:
> "Stephen J. Gowdy" wrote: > > > > This isn't really a USB question, is it? Anyway, try "man dump" (if that > > doesn't work install the dump package). > > >From http://lwn.net/2001/0503/kernel.php3 > > > Trashing your filesystem with dump. It has been known for a very > long time that using dump to back up live filesystems can result in > corrupt backups. It turns out that, with Linux kernels through > 2.4.4, > dumping a live filesystem has the potential to corrupt the > filesystem > in place, even if the dump process has no write access. > > Alexander Viro reported the bug which makes this possible. It can > happen only on SMP systems, and is not easy to trigger, but it is > there. Essentially, if the filesystem allocates a new metadata block > for the filesystem, and a separate process reads that block at the > wrong time, the wrong data will be written back to disk. The fix > is relatively straightforward, and has already been incorporated > into 2.4.5pre1. > > Linus pointed out an interesting little fact as part of this > discussion: dump will not work correctly on 2.4-based systems in > any case. The filesystem keeps quite a bit of useful information > in the page cache - and will do so even more in the future. dump, > however, works with the raw device, which deals with the buffer > cache > instead. The two are not always synchronized, and it is possible > that dump will end up reading the wrong data. In case that's not > clear enough: > > So anybody who depends on "dump" getting backups right is > already playing russian rulette with their backups. It's not at > all guaranteed to get the right results - you may end up having > stale data in the buffer cache that ends up being "backed up". > > For now, there is really no easy way to fix dump for 2.4. If you're > using it, this might be a good time to go looking for a different > tool. > > > > > > There are 12 partitions on one drive and one on another that I want to > > > back up. > > > If you have a partition mounted at /usr/foo You can > backup that one partition with something like > > cd /usr/foo && tar clzf /some/where/permanent/foo.tgz . > > man tar for details. > > -- /------------------------------------+-------------------------\ |Stephen J. Gowdy | SLAC, MailStop 34, | |http://www.slac.stanford.edu/~gowdy/ | 2575 Sand Hill Road, | |http://calendar.yahoo.com/gowdy | Menlo Park CA 94025, USA | |EMail: [EMAIL PROTECTED] | Tel: +1 650 926 3144 | \------------------------------------+-------------------------/ _______________________________________________________________ Have big pipes? SourceForge.net is looking for download mirrors. We supply the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
