Hello, 18.12.2009 14:38, Oliver Lehmann wrote: > Dan Langille writes: > >> Have you considered that perhaps your backup is corrupted? That is, the >> USB2 HDD that you have backed up to contains a disk error? >> >> I would be very careful with that HDD, whatever you do, especially if >> that is your only backup of this data.
I agree with Dan... I see the same sort of problems relatively often (15 times during the last 3 months), but I know *I* can accept that fault rate. This happens, as far as I can see, only with external drives (USB in your and other cases, FireWire here), so I attribute it to imperfect external disk controller chips or USB / FireWire stacks. Whenever I saw those sort of errors on internal disks, I either get log messages or can identify faulty disk drives using smartctl. For external disks, this usually doesn't work. :-( > > I'm starting an offline SMART test now but I doubt that this will reveal > anything. The disk has a UDMA_CRC_Error_Count of 1 but this is not that > much. Right now I can't think that the disk has a problem. If this would > be the case and I would access a file on a corrupt disk FreeBSD would have > spammed my console already with read errors. Same goes for write. > > I'll let you know what the SMART analysis revealed. > > Is there a way to force bacula to re-read the backups after they where > written or do I have to schedule continuous restores to make sure they stay > readable? No, none that I know. An actual restore is the only way to find this. To make sure your restores don't fail, run the SD with '-p', and *really close watch for those errors in the reports*. That works for me - if I had really critical data saved only once, I'd be worried. As it is, I use the external disks as temporary storage and for low-priority backups, so those problems aren't really serious here. (Actually, this confirms my belief that most low-cost external HD cases are hardly ever really good, and often are crap...) Cheers, Arno > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > http://p.sf.net/sfu/verizon-dev2dev > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users > -- Arno Lehmann IT-Service Lehmann Sandstr. 6, 49080 Osnabrück www.its-lehmann.de ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
