> Follow-up::
>
> The drive that failed resulted in a file_mark_error, but the larger
> drive has been successfull with repeatable backups. After checking the
> media back in dos, there was a bad-block. An attempted re-format with
> CBD 4.X on the Colorado 5GB failed and wiped the media to unusable.
>
> Second note:
>
> #if 0
> drive->dsc_overlap = 1;
> #else
> drive->dsc_overlap = (drive->id->capability & 0x20) ? 1 : 0;
> #endif
>
> We have discussed this issue in the past.
> The test maybe wrong, but the result is success; therefore, since
> dsc_overlap does not appear to behave nicely (based on imperical tests).
>
> Would 'drive->dsc_overlap = 0;' seem practable? I still have not read all
> of the referrence material you have suggested.
First we disable DMA by default on IDE chipsets back in August, and now we
think of disabling dsc_overlap.. which will just take away most of my work
on optimizing the ide-tape driver for no good reason.
That's not the way to solve problems. We must first diagnose and fully
understand the real cause of a problem. Only then we might try to fix it.
Gadi
> Other test observed that I can not setup xfer_rates at init time on
> a new chipset that is non-bootable. I get a status value of 0x01
> when using Dave Millers set_xfer stripped from cmd646.c with
> 'drive->dsc_overlap = 1;' and the system (SMP) hangs hard; however,
> with it set to 0, I have full success in tuning the tape drive.
> We get a series of stat values 0xd0 then 0x50 between programming
> commands.
>
> I know that what DM has written works nicely, since I can enable
> DMA mode 2 via chipset tuning on both tape drives, the driver does
> acknowledge the fact, and hdparm does correctly report the dma modes.
>
> On Sat, 9 Jan 1999, Andre M. Hedrick wrote:
>
> > Gadi,
> >
> > I looked at what you did with ide-floppy and repeated with
> >
> > /*
> > * Some tape drives require a long irq timeout
> > */
> > #if 0
> > #define IDETAPE_WAIT_CMD 60
> > #else
> > #define IDETAPE_WAIT_CMD (5 * WAIT_CMD)
> > #endif
> >
> >
> > and I have two tapes under SMP streaming, opps, maybe one now.
> >
> > What is the preferred wait timeout?
>
> Cheers,
> Andre Hedrick
> The (NEW) Linux IDE guy
> The APC UPS Specialist for Linux
>
> http://www.dyer.vanderbilt.edu/server/udma/
> http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.2.bin.tar.gz
>
> You just need a bigger hammer, or learn how to swing the one you have better.
> (C) me.....
>
>
>
>
>
>
>
>
>
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