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SubjectDVD-RAM errors (was: DVD-RAM crashing system)
This was my original problem:

> ... bought a Dell Poweredge 600 box with RH 7.3 (2.4.18-4 #1) pre-
> installed, and SCSI hard disks. Added a Matsushita DVD-RAM LF-D311 atapi
> dvd->ram (that, along with a cd-rom, are the only IDE devices).

> Now, when I do a full backup (as opposed to a differential; I'm using
> Microlite's BackupEdge, a Super-Tar), the machine (sometimes) hangs with
> the error message:

> "Serverworks OSB4 in impossible state. Disable UDMA or if you are using
> Seagate then try switching disk types on this controller. Please report
> this event to OSB4: continuing might cause disk
> corruption."

This was Mr. Cox's solution:

> Update to 2.4.20. That will put IDE disks into MWDMA2 on the Serverworks
> OSB4 and avoid the mistrigger with CD-ROM errors. The later serverworks
> (CSB5, CSB6) is fine btw but can hit the CD-ROM mistrigger too

So, now, I'm using kernel 2.4.20-19.7 #1, and my backups no longer work. :-(
(BackupEdge is essentially a pretty front end to tar, and) [w]hen I issue a
command like 'tar cvf /dev/scd0 my-files', the machine hangs for a couple of
seconds, writes nothing to DVD, and I get these errors:

Aug 3 13:40:08 gemach kernel: Current sd0b:00: sense key Data Protect
Aug 3 13:40:08 gemach kernel: I/O error: dev 0b:00, sector 4
Aug 3 13:40:08 gemach kernel: SCSI cdrom error : host 2 channel 0 id 0 lun 0
return code = 28000000

Some interesting messages:

Kernel command line: ro root=/dev/sda9 hda=ide-scsi ide=nodma
ide_setup: hda=ide-scsi
ide_setup: ide=nodma : Prevented DMA
Uniform Multi-Platform E-IDE driver Revision: 7.00beta3-.2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
SvrWks CSB6: IDE controller at PCI slot 00:0f.1
SvrWks CSB6: chipset revision 160
SvrWks CSB6: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x08b0-0x08b7, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0x08b8-0x08bf, BIOS settings: hdc:DMA, hdd:pio
hdc: GCR-8481B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hdc: attached ide-cdrom driver.
hdc: ATAPI 48X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
hda: attached ide-scsi driver.
scsi2 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: MATSHITA Model: DVD-RAM LF-D311 Rev: A123
Type: CD-ROM ANSI SCSI revision: 02
hda: DMA disabled
hdc: DMA disabled
hdc: DMA disabled

I throw myself upon the mercy of the NG. :-)

Nachman Yaakov Ziskind, EA, LLM
Attorney and Counselor-at-Law
Economic Group Pension Services
Actuaries and Employee Benefit Consultants
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