Bacula-users

Re: [Bacula-users] tape error and bacula: ...block numbers differ

2009-02-07 06:19:15
Subject: Re: [Bacula-users] tape error and bacula: ...block numbers differ
From: Kern Sibbald <kern AT sibbald DOT com>
To: Ralf Gross <Ralf-Lists AT ralfgross DOT de>
Date: Sat, 7 Feb 2009 12:17:33 +0100
On Saturday 07 February 2009 11:33:58 Ralf Gross wrote:
> Kern Sibbald schrieb:
> > 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.
>
> The verify job hasn't found any errors, so it seems that all data
> that was backed up could be read.

Verify will not find missing data, unless you restored everything and compared 
it to the original, so I am still a bit skeptical ...

>
> I still think it would be a good thing if bacula notifies the
> user about this problem by mail and in the final job output.

Once the message is sent by Bacula, you have full control over how to send it.  
It is just a question of configuring your Bacula.

I have modified the current development version so that any difference of 
block numbers greater than one causes the Job to fail rather than simply 
report an error.

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