>>>>> On Mon, 23 Jan 2012 18:47:31 -0500, mark bergman said: > > I'm experiencing a critical problem where tape labels on volumes with data > get corrupted, leaving all data on the tape inaccessible to bacula. > > I'm running bacula 5.2.2 built from source, under Linux (CentOS 5.7 > x86_64). > > This problem has happened with approximately 15 tapes over approximately 6 > months, mostly new LTO-4 media, but some LTO-3 media that's being reused. > The problem is sporadic, appearing in approximately 1 out of 60 tapes > per week. > > I do not think the issue is related to the physical media or the tape > drives. One tape was last written successfully when in drive 0, then appears > corrupt when a later job tries to use is in drive 1. Another tape was last > written successfully when in drive 1, then appears corrupt when a later job > tries to use it in drive 0.
Why do think it isn't a hardware problem? Bacula only looks at the label when a volume is mounted, so it could be written unsuccessfully but you wouldn't know that until later. > Here are the log records for a particular volume. It was labeled about > Dec 22, 2011. First used on Jan 4 2012. Used successfully for 10 jobs > (350.49GB), then the label was corrupted. > > ------------------------------ > 04-Jan 06:24 sbia-infr-vbacula JobId 42676: Using Volume "004090" from > 'Scratch' pool. > 04-Jan 06:25 sbia-infr-vbacula JobId 42676: Wrote label to prelabeled Volume > "004090" on device "ml6000-drv1" (/dev/tape1-ml6000) > 04-Jan 06:25 sbia-infr-vbacula JobId 42676: New volume "004090" mounted on > device "ml6000-drv1" (/dev/tape1-ml6000) at 04-Jan-2012 06:25. Is /dev/tape1-ml6000 a non-rewinding device (like /dev/nst0)? > At this point, the volume 004090 is unusable. Running 'btape' on that volume > reports > ---------------------------- > [root@sbia-infr1 working]# ../bin/btape -v ml6000-drv0 > Tape block granularity is 1024 bytes. > btape: butil.c:290 Using device: "ml6000-drv0" for writing. > 23-Jan 18:14 btape JobId 0: 3301 Issuing autochanger "loaded? drive 0" > command. > 23-Jan 18:14 btape JobId 0: 3302 Autochanger "loaded? drive 0", result is Slot > 9. > btape: btape.c:477 open device "ml6000-drv0" (/dev/tape0-ml6000): OK > *readlabel > btape: btape.c:526 Volume has no label. > > Volume Label: > Id : **error**VerNo : 0 > VolName : > PrevVolName : > VolFile : 0 > LabelType : Unknown 0 > LabelSize : 0 > PoolName : > MediaType : > PoolType : > HostName : > Date label written: -4712-01-01 at 00:00 > ---------------------------- > > > > > However, there _is_ data on the tape. I'm able to read the tape via dd > (ibs=64k). The ASCII data at the beginning of the tape shows fragments of the > Bacula label and data that corresponds to some of the backups: The output of od -tx1 /tmp/vol4090.header | head -n 40 might be useful, to see why Bacula rejects it. __Martin ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
