Hello,
The problem described in the email below is probably an important data loss
problem due (most likely) to an I/O error, but more importantly due to a
misconfigured tape drive. From the information I see below, it appears to me
that you have lost significant data. This is probably due to the fact that
the HBA or the tape drive is running in asynchronous mode (cached or
buffered) while Bacula *requires* you to run everything concerning tapes in
synchronous mode -- please see the Tape testing chapter for more information.
This data loss due to asynchronous mode will probably also occur when your
tape fills.
Best regards,
Kern
=============
From: Ralf Gross <Ralf-Lists <at> ralfgross.de>
Subject: tape error and bacula: ...block numbers differ
Newsgroups: gmane.comp.bacula.user
Date: 2009-02-04 14:59:07 GMT (19 hours and 30 minutes ago)
Hi,
I have a problem with a new lto-4 tape. Only 411 GB were written on it, then
bacula detected an write error.
JobId 9250: Error: block.c:568 Write error at 411:14724 on
device "ULTRIUM-TD4-D2"
(/dev/ULTRIUM-TD4-D2). ERR=Eingabe-/Ausgabefehler.
JobId 9250: Error: Re-read of last block OK, but block numbers differ.
Last block=32305463 Current block=32307189.
JobId 9250: End of medium on Volume "A00151L4" Bytes=411,923,570,688
Blocks=6,385,223 at 03-Feb-2009 20:44.
And at the same time in the kernel log:
kernel: sense key: Medium Error
kernel: Additional sense: Write error
kernel: Info fld=0xfc00
No doubt there was a problem. The big question is: will this be a problem
during a restore? bacula changed the tape and continued but didn't mark
the tape as faulty.
The job is still running and will backup 9 TB. Any idea how to test the tape?
Which of the b* tools would be the right one for this?
Ralf
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