Re: SCSI Tape corruption - update

[Geert Uytterhoeven]

On Mon, 7 May 2001, Lorenzo Marcantonio wrote:
> On Mon, 7 May 2001, Rob Turk wrote:
> > Have you ruled out hardware failures? There's been a few isolated reports
> 
> That tape drive (Sony SDT-9000, less than 2 years of service) works
> perfectly on Windows NT (were it was before) and even on Linux 2.2
> 
> Also the cartridge was brand new.

In the mean time I down/upgraded to 2.2.17 on my PPC box (CHRP LongTrail,
Sym53c875, HP C5136A  DDS1) and I can confirm that the problem does not happen
under 2.2.17 neither.

My experiences:
  - reading works fine, writing doesn't
  - 2.2.x works fine, 2.4.x doesn't (at least since 2.4.0-test1-ac10)
  - hardware compression doesn't matter
  - I have a sym53c875, Lorenzo has an Adaptec, so most likely it's not a
    SCSI hardware driver bug
  - I have a PPC, Lorenzo doesn't, so it's not CPU-specific
  - corruption is always a block of 32 bytes being replaced by 32 bytes from
    the previous tape block (depending on block size!) (approx. 6 errors per
    256 MB)

Lorenzo, can you please investigate the exact nature of the corruption on your
system?
  - How many successive bytes are corrupted?
  - Where do the corrupted data come from?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [e-mail]

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds