Re: [Bacula-users] How to recover from lost connection

Fri, 22 Apr 2016 00:57:08 -0700

Hello Patti,

Yes, the restart command is in its "infancy" -- that is it does not currently (on purpose) handle all cases -- each failure must have explicit code to permit a partial backup to be used.  This is to ensure as much integrity of the final backup as possible. 

If you or anyone else has some explicit cases where a connection dropped and Bacula restarts from the beginning rather than as close as possible to the failure, please send me the exact output from the original backup failure showing the connection failure.  That way I can track down the code path of the failure and make sure it permits restarts.

Best regards,
Kern

On 04/21/2016 07:00 PM, Clark, Patti wrote:
Volume sizing is used for disk-based volumes – do not use it for tape media volumes.  

If you are using spooling (recommended) your spool size parameters are used to control the size of your job spool and the total spool space available.  The example below shows 50GB of job spool size and a total of 1TB of spool space.  You will need to try sizes that are appropriate for your environment and see what performs best for you.  The job spool size when reached will write to tape at that point.  It will continue with spooling and writing to tape media until the end of data has been reached.  Also for something like a NAS, it’s best to break the backups into more manageable chunks.  Don’t try to backup the entire NAS in one job.  And yes, use the heartbeatinterval feature.

  Maximum Spool Size = 1000GB;

  Maximum Job Spool Size = 50GB;


You don’t mention which version of Bacula that you are using.  If it is 7.4.x is has a resume command that will restart failed jobs roughly from the point that the backup failed.  The documentation will talk about this under Incomplete Jobs.  I have found the use of this feature to be great when it works, otherwise it will start from the beginning as a new job using the job schedule to determine the level of the backup.  Client connection drops are hit and miss on the resume working.

Patti

From: Ian Douglas <i...@zti.co.za>
Organization: Zero 2 Infinity
Reply-To: "i...@zti.co.za" <i...@zti.co.za>
Date: Thursday, April 21, 2016 at 9:33 AM
To: "bacula-users@lists.sourceforge.net" <bacula-users@lists.sourceforge.net>
Cc: Josh Fisher <jfis...@pvct.com>
Subject: Re: [Bacula-users] How to recover from lost connection

hi All

On Thursday 21 April 2016 07:21:08 Josh Fisher wrote:

Yes, most likely. In the 3 hours or so it took to despool to tape, the
SD->FD TCP connection was dropped for some reason. I am of the opinion
that not all interfaces interpret IEE 802.3az Energy-Efficient Ethernet
in the same way, and when one interface puts its transmitter into sleep
mode, the receiving interface sees it as a dropped connection. Setting a
heartbeat should work, if that is what is happening.

Okay thanks, will add that. I guess I will have to start the backup over, how
do I remove what's in the catalog so that I can reset the tape?

Is there a way to write to tape every 50GB or so? I see setting for volume
size but as I understand it (newbie and all) that that refers to the tape size
not the "chunk" size.

Thanks, Ian

--
Zero 2 Infinity - The net.works
Phone +27-21-975-7273

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