Did you get similar tapetype results for the SDX1-35C tapes ?
I got an error last night when I set the tape type to the
AIT-SDX1-25C-NOHWC listed below...
*** A TAPE ERROR OCCURRED: [[writing filemark: Input/output error]].
I was skeptical of the 0 length filemark, but left it intact since
that is what tapetype reported.
I am going to disable hardware compression since the dumps files are
compressed by amanda.
Thanks
Mike Hogsett
Computer Science Laboratory
SRI International
> On Thu, 29 Nov 2001 at 4:48pm, Mike Hogsett wrote
>
> > define tapetype AIT-SDX1-25C-NOHWC {
> > length 24192 mbytes
> > filemark 0 kbytes
> > speed 4051 kps
> > }
>
> > define tapetype AIT-SDX1-25C-HWC {
> > length 21504 mbytes
> > filemark 0 kbytes
> > speed 3606 kps
> > }
> >
>
> Thanks for posting these! (If it's working, you should also be able to
> add them to the FAQ-O-Matic.)
>
> Just so you realize, though (you may already), the tape length returned by
> tapetype using hardware compression is meaningless. Tapetype writes
> random data to the tape, which doesn't compress well. As you can see, it
> actually takes up *more* tape when "compressed". To use hardware
> compression with amanda, take the NOHWC value and multiply it by a
> realistic estimate of compression ratio, then use that for the length
> value. E.g., I use an AIT1 drive with SDX1-35C tapes, for which tapetype
> told me 33077 mbytes. In my tapetype, I use 50000 mbytes. I haven't hit
> EOT yet.
>
> --
> Joshua Baker-LePain
> Department of Biomedical Engineering
> Duke University
