On 1/24/12 2:22 PM, mark.berg...@uphs.upenn.edu wrote: > In the message dated: Tue, 24 Jan 2012 19:09:15 GMT, > The pithy ruminations from Martin Simmons on > > > Thanks for replying. > > > <Re: [Bacula-users] critical error -- tape labels get corrupted, previous > backu > ps unreadable> were: > => >>>>> 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? > => > > I don't think it's a hardware problem because: > > the vast majority of tape access (read or write) doesn't result > in corrupted labels > > there aren't SCSI, tape, or bacula errors reported during backups > (within Bacula, the OS, or the tape library console) > > the tapes are readable--though the data is not usable by bacula > > the problem occurs on tapes that have been written and read in > both drives (this doesn't rule out some common element in the > tape library) > Perhaps someone else already suggested this and I missed it--this looks like somehow the tapes were rewound behind bacula's back--could that explain the behavior you are seeing?
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