Messages in this thread | | | Date | Thu, 21 Jun 2001 11:33:40 +0200 (CEST) | From | Geert Uytterhoeven <> | Subject | Re: SCSI Tape corruption - update |
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On Tue, 8 May 2001, Geert Uytterhoeven wrote: > 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?
Yesterday I noticed the same corruption under 2.2.19 (yes, I run amverify after backing up my system now, so it detects corruption through the gzip CRCs).
I'll do some more tests (when I find time) to get a higher statistical certainty that it really doesn't happen under earlier 2.2.x kernels.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
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
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