On Fri, 2 Oct 2009, Klaus Troeger wrote:

> LTO-3 drive (equipped with "only" LTO-2 tapes, but ....)
>
> Physical drive performance is 28sec for 1 Gigabyte, so ~35MB/sec
>
> [root@denbvsbcks1 disk1]# dd if=/dev/zero of=swapfile bs=1024
> count=1000000
> 1000000+0 records in
> 1000000+0 records out
> 1024000000 bytes (1.0 GB) copied, 79.907 s, 12.8 MB/s
> [root@denbvsbcks1 disk1]# date;tar cvf /dev/nst0 swapfile ;date
> Fri Oct  2 06:00:22 CEST 2009
> swapfile
> Fri Oct  2 06:00:50 CEST 2009
>
> So, it's not the physical hardware, it has to be Bacula itself.

You fed it 1Gb of nulls and it only ran at 35Mb/s???

Try feeding it random (uncompressable) data please.




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