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 ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
