How about some more details?
I'm beginning to wonder if buffered mode got broken. I do know I just did some
tests with a DDS3 drive and I consistently got 1MB/s or better on dumps.
On Fri, 22 Sep 2000, Shannon Hendrix wrote:
>
>
> I'm interested in hearing from anyone who uses DAT drives on a DPT SCSI
> controller, preferrably with FreeBSD 4.1 and an Intel system.
>
> I find the speed is very slow, and I know in the past these drives were fine
> with FreeBSD, though I can't remember which release now. With my most recent
> install of FreeBSD 4.1, I am lucky to get 3MB/minute on a drive and controller
> combination that I know can hit 45MB/min.
>
> Right now, with NetBSD on an old Sparc 5, they still get 20MB/min or better.
>
> No errors, even large restores are perfect, but take many hours to finish.
>
> The controller I have is a DPT-2044W, and it currently has the ROM version DPT
> suggested for use with tape drives. The drives in question are an Archive
> Python 4-tape robot and a Seagate Scorpion. Both are DDS2 drives.
>
> No load on the DPT except for tapes and a CD-ROM burner.
>
> I haven't been able to find much information on this particular setup, and
> most tape woes seem error related, or related to another platform.
>
>
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