Hi, On 6/6/2007 10:43 PM, Lucio Crusca wrote: > Arno Lehmann wrote: >> Unless you get these errors with every DVD you use, I'd say yes, this >> disk is corrupt. > > Are you suggesting that there can be a situation where bacula gives read > errors on every DVD media while those DVDs aren't corrupt?
No, what I wanted to suggest was that I'd assume that specific disk is corrupt, when other disks work correctly. > Granted, DVDs aren't very much reliable, but in this case it's quite a > strange > situation: this is the first DVD I use to test bacula functionality, it's > good quality DVD+R (1.40 EUR/piece) but bacula started giving read errors > straight from the first backup/restore test. Nothing strange there IMO... > However in the first tests I > retried the recovery and it worked ok the second time, which made me think it > could be more a software problem than a corrupt media. Well, the restore code is quite thoroughly tested, and once the data is read by the SD I don't think it matters if your volumes are disk files, tapes, or DVDs. > Obviosly I'm going to > repeat the tests with another disc, but I just want be aware of all the > possible causes of the problem. I'd suggest to dump the whole DVD to a file, multiple times, and compare these files. I would not be too astonished if there are differences... probably even related to temperature, both room temperature and drive-internal temperature. > >> (Which would illustrate my point to *not* use DVD for >> backup or archival purposes...) > I believe there are situations where having a DVD backup it's better than > lacking any kind of backup. Definitely. > Not everyone is willing to spend $$$ in order to > have a LTO system or a backup server, Well, if you consider the low capacity of DVDs and the resulting effort of media handling, there are some not overly expensive alternatives. Using external (and robust!) USB disk, using a RAID-5 disk array for backup purposes exclusively, or using an affordable tape drive with medium capacity might all turn out less expensive quite fast. > and when faced with the choice to spend > thousands dollars or to risk data loss, well, they often choose to risk data > loss hoping it won't actually happen to them... I dare say you can build a workable backup solution for some hundred GBs for less than a few thousand dollars... and, of course, you've got to know the value of your data. (I knew a freelance designer once who had all his work on one 1TB external hard disk. No backups, no copies. When the disk died he could not afford professional data recovery. I'd bet the cost of (at least) a second disk would have been much less than what he lost because he lost his business...) > in such cases (not uncommon) > a DVD backup it's better than no backup at all. No matter how good the > reasons you give them to buy a serious backup solution are. My point is that it's possible to get a reasonable backup without spending thousands of dollars. At least for the amounts of data you would dare storing on DVDs. Arno > > Lucio. > -- IT-Service Lehmann [EMAIL PROTECTED] Arno Lehmann http://www.its-lehmann.de ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
