Bacula-users

Re: [Bacula-users] bacula doesn't write on the whole tape

2015-04-01 11:38:21
Subject: Re: [Bacula-users] bacula doesn't write on the whole tape
From: Markus Rosjat <rosjat AT ghweb DOT de>
To: Kern Sibbald <kern AT sibbald DOT com>, bacula-users <bacula-users AT lists.sourceforge DOT net>
Date: Wed, 01 Apr 2015 17:32:52 +0200
Sorry for the delay

Am 27.03.2015 um 01:21 schrieb Kern Sibbald:
> Hello,
>
> There is a section in the manual that provides a step by step 
> procedure for testing writing to tapes.  In addition to what John 
> wrote you, there are two other obvious things for you to do:
running a version 3.0.x here so I'll need to figure if I can find the 
manual :)

> 1. Ensure that tape drive hardware compression is turned on.
>
it is turned on
> 2. Send the Job report output when a tape becomes full to this list. 
> That way we can see why Bacula terminates writing on the tape.
>
I'll do this later on
> If you are writing data that is already compressed or encrypted in one 
> form or another, then the apparent amount of data that you write to 
> the tape (after compression or encryption) will be about 1/2 what 
> manufacturers say the tape holds.  They always cite tape sizes 
> assuming a 2:1 compression of data being written on the tape.
>
> Best regards,
> Kern
>
> On 15-03-26 05:26 AM, Markus Rosjat wrote:
>> Hi there,
>>
>> I know this question was asked befor and maybe it will be again in the
>> future but I'm kinda frustrated with it.
>> We have a LTO-3 hp tapeloader and suddenly our jobs began to randomly
>> mark tapes as full even the tape was writen with half of the amount or
>> sometimes less. I found some old post about it on the list but with a
>> aswer like
>> "solved but I dont tell because it was sooo simple" you get frustrated
>> again. What we did so far without solving the problem.
>>
>>    1. replacing the scsi controller -> no effect
>>    2. replacing the scsi cable -> no effect
>>    3. replacing the terminator -> no effect
>>    4. replacing the tapeloader -> no effect
>>
>> so even with all physical parts removed bacula insist that the tapes are
>> fully writen after 150gb or even 80gb. We used brand new, never written
>> tapes too and got told they are full. but checking showed we had once
>> again just written less then expected.
>>
>> So if somebody out there with the same problem and a solution please 
>> share.
>>
>> Regards
>>
>

-- 
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