Oh My mistake...
Thank you a lot ppl!
I'll have to buy a better tape drive :)
On Thu, Jul 16, 2009 at 9:43 AM, Ralf Gross <ralf-li...@ralfgross.de> wrote:
> Eduardo Sieber schrieb:
> >
> > I Have a bacula verion backup-dir Version: 2.4.4 (28 December 2008)
> > i486-pc-linux-gnu debian 5.0, intalled on a Ubuntu 9.1 server. I have 2
> tape
> > drives attached on this server (A DLT 40/80Gb and a sony SDX470V 40/102
> GB).
> >
> > I've ran btape on both tapes and everything is fine on the test.
> >
> > So, I have a job, and the estimate command for this job says:
> > 000 OK estimate files=94902 bytes=58,095,727,131
> >
> > Something about 56Gb, that fits on my AIT tape right?
> >
> >
> > So, runing this job, I got this message:
> > Please use the "label" command to create a new Volume for:
> > Storage: "AIT-1" (/dev/nst0)
> > Pool: Semanal
> > Media type: AIT-1
> > 15-Jul 09:52 backup-sd JobId 8: Job Semanal.2009-07-15_06.51.40.17
> waiting.
> > Cannot find any appendable volumes.
> >
> > This way I think: The tape is full and bacula is requesting a new one to
> > finish the job. After this, I proceed the command estimate at the Storage
> > daemon, and I got:
> >
> > Running Jobs:
> > JobId 8 Job Semanal.2009-07-15_06.51.40.17 is running.
> > Backup Job started: 15-Jul-09 15:58
> > Files=66,399 Bytes=48,242,126,113 Bytes/sec=845,789 Errors=0
> > Files Examined=66,399
> > Processing file:
> > /samba/Publica/FUUUTBOOOL/FUTEBOL_SDAB/Sdab2_x_PM1/parte_18.MPG
> > SDReadSeqNo=5 fd=5
> >
> > Director connected at: 16-Jul-09 07:48
> >
> > He writes abut 40GB And get the tape full. But with HW compression it
> must
> > writes 100GB!
>
>
> No it must no!
>
>
> DLT = 40/80GB
> SDX470V AIT = 40/104GB
>
> native capacity = 40GB
> This should fit on the tape in all cases
>
> maximum compressed capacity = 80GB (DLT), 104 GB (AIT)
> This is the _theoretical_ maximum if your data is not already
> compressed on the data server
>
> You will see the max. capacity only in rare cases. If you have many
> zip/mpeg/mp3 files, you will not get anything near the theoretical
> maximum.
>
> It always depends on your data....
>
> Quoting wikipedia:
>
> http://en.wikipedia.org/wiki/Digital_Linear_Tape
> All (S)DLT drives support hardware data compression. The often-used
> compression factor of 2:1 is optimistic and generally only achievable
> for text data; a more realistic factor across a file system is 1.3:1
> to 1.5:1. Note that drive compression applied to pre-compressed data
> can actually make the written data larger than having compression
> turned off in the tape drive.
>
>
>
> Ralf
>
>
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