BAT seems not to use the Maximum Volume Bytes when it calculates the % used
(it uses the average amount used per tape for each MediaType according to the
source code).

"Better" is subjective, but I think Maximum Volume Bytes is meaningless if you
use hardware compression on the tapes (unless you don't care about wasting
tape space).

__Martin


>>>>> On Fri, 8 Sep 2017 13:52:22 +0000, Hicks, Daniel CTR OSD DMEA said:
> 
> Hello, 
> 
>  
> 
> I am using Bacula 9.0.3 on Centos7 and have the following issue when
> reviewing storage from bat. I am using LTO-5 tapes that are 1.5TB raw and
> 3TB compressed. I believe that I have set the Bacula-dir.conf tape pool
> definition correctly but when I look at bat after a single job wrote to
> tape. That job consisting of 479MG in size but bat reports that 48% of the
> tape is used. 
> 
>  
> 
> Please let me know if there is better way to define the tapes and if so
> where and how. 
> 
>  
> 
>  
> 
> # Tape pool definition
> 
> Pool {
> 
>   Name = Tape
> 
>   Pool Type = Backup
> 
>   Recycle = yes
> 
>   AutoPrune = yes
> 
>   Volume Retention = 5 years
> 
>   Maximum Volume Bytes = 1500G
> 
>   Storage = HP-Overland-TL
> 
> }
> 
>  
> 
> Thanks
> 
>  
> 
> Daniel Hicks
> 
> Senior Systems Analyst
> 
> DMEA IT Support

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