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Date: Tue, 21 Oct 2003 15:28:55 +0200
From: Arjan Knepper <arjan@jak.nl>
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Subject: IDE ATA ATAPI tape drive (AST0) causes system to stop responding.
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Hello,

Recently I installed a Dell PowerEdge 600 SC with FreeBSD 
4.8-RELEASE-p13 for a client. This system has a Seagate STT20000A IDE 
tape drive which causes the system to stop responding when using the 
tape drive for backups. A hard powercycle is needed to get the system 
running  again.

Today the last command issued is:
  mt fsf 1

The last two lines on the console are:

 AST0: rezero command timeout resetting
 ATA2: resetting devices ..

But it also happend while writing or reading to or from the backup tape

I have googled around and tried various suggestions but with no succes.

I also tried FreeBSD-STABLE but problem persists.

Does anyone have a clue what might be wrong?

Thanks
Arjan

dmesg output:

> atapci0: <Generic PCI ATA controller> port 
> 0x900-0x90f,0x36c-0x36f,0x168-0x16f,0x3ec-0x3ef,0x1e8-0x1ef irq 11 at 
> device 14.0
> on pci0
> ata2: at 0x1e8 on atapci0
> ata3: at 0x168 on atapci0
> atapci1: <Generic PCI ATA controller> port 
> 0x8b0-0x8bf,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device 
> 15.1 on pci0
> ata0: at 0x1f0 irq 14 on atapci1
> ata1: at 0x170 irq 15 on atapci1

> acd0: DVD-ROM <LITEON DVD-ROM LTD163> at ata2-master PIO4
> ast0: TAPE <Seagate STT20000A> at ata2-slave PIO4

sysctl for ata

> hw.ata.ata_dma: 1
> hw.ata.wc: 0
> hw.ata.tags: 0
> hw.ata.atapi_dma: 1

kernel config

> # ATA and ATAPI devices
> device          ata
> device          atadisk                 # ATA disk drives
> device          atapicd                 # ATAPI CDROM drives
> device          atapifd                 # ATAPI floppy drives
> device          atapist                 # ATAPI tape drives