Re: st corruption with 2.4.3-pre4

[Geert Uytterhoeven]

On Mon, 19 Mar 2001, Jeff Garzik wrote:
> Is the corruption reproducible?  If so, does the corruption go away if

Yes, it is reproducible. In all my tests, I tarred 16 files of 16 MB each to
tape (I used a new one).
  - test 1: 4 files with failed md5sum (no further investigation on type of
	    corruption)
  - test 2: 7 files with failed md5sum, 7 blocks of 32 consecutive bytes were
	    corrupted, all starting at an offset of the form 32*x+1.
  - test 3: 7 files with failed md5sum, 7 blocks of 32 consecutive bytes were
	    corrupted, all starting at an offset of the form 32*x+1.

The files seem to be corrupted during writing only, as reading always gives the
exact same (corrupted) data back.

Copying files from the disk on the MESH to a disk on the Sym53c875 (which also
has the tape drive) shows no corruption.

> you rip out the scsi_error patch in 2.4.3-preXX?

After reverting that patch, the problem got worse:
  - test 4: 15 files with failed md5sum, a total of 40 blocks of 32 consecutive
	    bytes were corrupted, all starting at an offset of the form 32*x+1.

So it seems to be related to scsi_error.c.

If you have some suggestions, I'm willing to try them. I'd like to trust
whatever Amanda writes to my backup tapes :-)

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