On Tuesday 09 August 2005 12:31 pm, Sebastian Jeremias wrote:
Hi, I'm having troubles compressing a DDS-4 tape. I have an HP C5683A drive, and when I do 'mt -f /dev/nst0 status' (or mtst) I get:
twist:/opt/ltt # mtst -f /dev/nst0 status SCSI 2 tape drive: File number=0, block number=0, partition=0. Tape block size 0 bytes. Density code 0x8c (EXB-8505 compressed). Soft error count since last status=0 General status bits on (41010000): BOT ONLINE IM_REP_EN
The problem is that it's not using compression, although it's turned on. My questions are: - Is EXB-8505 the right compression mode? I read you could change it to DDS-4, but what's the compression code for DDS-4? - Do I need a hardware specific driver for the SCSI controller for the O.S. to recognize the tape in the proper way? - Something I'm missing?
All of the DAT drives I've ever used did the compression without being told. Are you sure that isn't the case here? What makes you think it isn't using compression? BTW, figure on getting only 1.6 times the data (or less) on the tape when using compression compared to the 2.0 they tell you that you will get.