The original Question:
> I have just got a Sony DDS-2 DAT drive that is connected to a Sparc 2
> running 4.1.3. The problem I have is that I only get write rates of
> around 9k per second. This is needless to say, just a little
> disappointing for a drive that (I believe) should be capable of around
> 400k/s minimum.
>
Thanks to the people who responded, including Laurel Arthur and some
others whose names I've forgotten.
This from Laurel:
>
> Yes - SunOS4.1.3 doesn't have any built-in information about DAT drives.
> So when you plug on into it, it will talk to the drive, but it treats it
> as a character device - result, very slow transmission rates! I had the
> same problem with a WangDAT tape drive when I first got it.
>
> Look at the scsi tape tables in /usr/kvm/sys/scsi/targets and add entries
> for your DAT drive (sorry, I don't have the information at my fingertips;
> but there should be details in your system manuals). Build a new kernel
> (you don't need to change the configuration in any way) and you should
> see dramatically improved performance.
>
And the entry needed for the Sony SDT-5000 in
/usr/kvm/sys/scsi/targets/st_conf.c is
/* Sony Model SDT-5000 4mm Helical Scan 4GB drive */
/* Added by K. A. Noll 1 Jun 1994 */
{
"SONY", 24, "SONY SDT-5000 ",
ST_TYPE_SONYDAT, 1024,
(ST_VARIABLE | ST_BSF | ST_BSR | ST_LONG_ERASE),
5000, 5000,
{ 0x00, 0x8C, 0x8C, 0x8C },
{ 0, 0, 0, 0 }
},
Also I neeeded to add this to /usr/kvm/sys/scsi/targets/stdef.h
#define ST_TYPE_SONYDAT 0x2a
Thanks All,
Happy Christmas,
Charles Hawkins
Research Systems Support
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