HP C6364A/C1537A Hardware Compression

[Karl Latiss]

On Mon, 2007-02-26 at 13:16 -0800, Krautkramer, John wrote:
> Hi,
> 
> I've been trying to enable hardware compression on a HP C6364A/C1537A
> SCSI tape drive. Searching google and this list, I've found questions
> but not any answers. I've found 'mt compression on' or 'mt
> defcompression' is supposed to do this but I don't see it working. 
> 
> I'm using a DDS1 tape capable of 2G uncompressed, 4G compressed for
> testing. I try turning it off with 'mt compression off' and it runs out
> of tape as expected. I try the above commands and I still run out of
> tape. The data I'm using as an experiment is 2.28G in total.
> 
> Any ideas? Is there a simple way to verify the compression is turned on?
> The response to 'mt status' is always the same:
> 
> [root at hbwpe2 prod]# mt status
> SCSI 2 tape drive:
> File number=0, block number=0, partition=0.
> Tape block size 0 bytes. Density code 0x13 (DDS (61000 bpi)).
> Soft error count since last status=0
> General status bits on (41010000):
>  BOT ONLINE IM_REP_EN
> 
> Thanks in advance for any ideas!
> 
You may wish to investigate /etc/stinit.def (or create it if not there)

man stinit (or /usr/share/doc/mt-st-0.8 on RHEL 4) for more info 

-- 
Karl Latiss <karl.latiss at atvert.com.au>
Atvert Systems