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SubjectRe: IDE tape and SMP(UP, too) and a CD-RW for fun

Robert,

Both "Jens Axboe" <axboe@image.dk> and "Chris Zwilling" chris@cloudnet.com
are the new guys for the IDE-CDROM and UNIFORM CDROM support.
Erik Andersen has gone to "gimp" or something. These gentlement were hand
picked by Erik.



Gadi,

The IDE-tape has faulted under a UP kernel 2.1.126 just like the SMP
kernels. There may be something bigger at hand. Can you repeat and
verify the findings.

Linux version 2.1.126 (root@Orion) (gcc version 2.8.1) #1 Mon Oct 26
22:50:59 CST 1998

AEC6210: IDE controller on PCI bus 00 dev a0
AEC6210: not 100ative mode: will probe irqs later
AEC6210: ROM enabled at 0xfebf8000
ide0: BM-DMA at 0xef90-0xef97, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0xef98-0xef9f, BIOS settings: hdc:pio, hdd:pio
PDC20246: IDE controller on PCI bus 00 dev 90
PDC20246: not 100ative mode: will probe irqs later
PDC20246: ROM enabled at 0xfebd0000
ide2: BM-DMA at 0xef40-0xef47, BIOS settings: hde:DMA, hdf:pio
ide3: BM-DMA at 0xef48-0xef4f, BIOS settings: hdg:pio, hdh:DMA
hda: QUANTUM FIREBALL ST6.4A, ATA DISK drive
hdb: QUANTUM FIREBALL ST3.2A, ATA DISK drive
hdc: QUANTUM FIREBALL EL10.2A, ATA DISK drive
hdd: QUANTUM FIREBALL EL10.2A, ATA DISK drive
CD-ROM CDU611, ATAPI CDROM drive
HP COLORADO 8GB, ATAPI TAPE drive
NEC CD-ROM DRIVE:251, ATAPI CDROM drive
hdh: IOMEGA ZIP 100 ATAPI, ATAPI FLOPPY drive
ide0 at 0xeff0-0xeff7,0xefe6 on irq 10
ide1 at 0xefa8-0xefaf,0xefe2 on irq 10 (shared with ide0)
ide2 at 0xefa0-0xefa7,0xef8e on irq 15
ide3 at 0xef80-0xef87,0xef8a on irq 15

ide-tape: ht0: I/O error, pc = a, key = 6, asc = 29, ascq = 0
ide-tape: ht0: I/O error, pc = a, key = 2, asc = 4, ascq = 1
last message repeated 109 times
ide-tape: ht0: I/O error, pc = 10, key = 2, asc = 4, ascq = 1
ide-tape: Couldn't write a filemark
ide-tape: ht0: I/O error, pc = 1, key = 2, asc = 4, ascq = 1

On Tue, 27 Oct 1998, Robert G. Brown wrote:

> On Mon, 26 Oct 1998, Andre M. Hedrick wrote:
>
> >
> > Find an poke this in as an initial test...........
> >
> > I find that this works on 2/4 chipsets that I have to test with under SMP.
> > PDC20246 appears to stablize but no DMA transefers are allowed.
> > HPT343 (unreleased chipset specific) appears to stablize with Fast-ATA
> > enabled, but no DMA transefers are allowed.
>
> Hmm, perhaps you (or the list members in general) can help me with a
> problem I'm just now encountering. We have a new dual PII 450 MHz with
> 512M SDRAM, an onboard AIC7895, a 9 GB Barracuda, a 6 GB IDE, and a HP
> IDE-ATAPI CD (re)Writer. Although the linux kernel has support for
> several IDE-ATAPI devices including the tape under discussion, so far I
> see no mention of IDE CD writers.
>
> I had expected that it would behave like a passive CD-ROM drive
> when/until I work out some way to use it. Indeed it does -- to a point.
> However, after a long read or large block copy from the CD, it appears
> to hang the interface. Any disk operations that requires a stat of the
> CD or its co-directories in the root filesystem hang, although the
> system itself stays "up" for a while. Perhaps most surprising of all,
> after hanging for a while (or while "thinking" for a while) the system
> then spontaneously reboots! This is most unusual to my experience --
> I've had a zillion system hangs where the system stops cold, but almost
> NO hangs where the system reboots itself with no warning and no message
> in many years experience.
>
> I'm not absolutely certain that all the problems with the system are
> associated with this CD -- we also had problems with the 1.05 eepro100
> driver and the eepro that appeared to go away when we popped in a
> linksys tulip -- but I've now experienced hangs followed by
> deterioration and a reboot three or four times when accessing the CD ROM
> in a most prosaic manner. Questions:
>
> Is anyone using an IDE-ATAPI CD writer in a linux system? Does anyone
> know whether there is anything that would be "unsafe" about them if used
> just as a CD drive? Is anyone planning to add IDE-CDR to the kernel?
> Does anyone (on kernel or SMP lists) have experience with sudden reboots
> and can they suggest a possible cause or fix? I don't think that this
> is really an SMP vs UP issue (although I could be wrong) as I've had
> trouble with both kernel flavors -- I rather think that it might be a
> speed/latency problem (as CPU's get faster, deep errors tend to surface)
> or one of those problems that seem to hit particular hardware
> combinations for no really good reason...

Cheers,
Andre Hedrick
The IDE-FNG for Linux
The APC UPS Specialist for Linux

http://www.dyer.vanderbilt.edu/server/udma/
http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.4.9.bin.linux.tar.gz




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