Re: Interrupts lost on IDE disks in RAID1 array

[Rick Thomas <rbthomas55@pobox.com>]

On Aug 27, 2005, at 10:27 AM, Simon Vallet wrote:

> Hi,
>
> I have a RAID1 setup on a BeigeG3, with one disk on /dev/hda, and the
> second one on /dev/hdc. The machine does not seem to like the setup,
> however, because I often get the following error :
>
> ide-pmac lost interrupt, dma status: 8080
> hdc: lost interrupt
> hdc: dma_intr: status=0x58 { DriveReady SeekComplete DataRequest }
>
> ide: failed opcode was: unknown
>
> This happens at random intervals, and is _very_ annoying. I already
> tried to change the disk & the cables, to no avail. In fact, I'm a bit
> desperate here, and I'd like to know if this is a kernel:settings
> problem (which would be fixable), or a hardware limitation: maybe this
> machine does not support DMA2 on two controllers ?
>
> There are other devices on the two IDEs : /dev/hdb is a CDROM drive
> (DMA1), and /dev/hdd an IDE ZIP drive. Removing them does not help...
>
> Thanks for any info/pointers on this.
> Simon

Hi Simon.

If I recall correctly, the on-board IDE chipset on the beige G3 can't 
handle more than one hard disk.  Lost interrupts were one of the 
symptoms.

The best way to handle multiple hard disks is to get a good cheap IDE 
PCI card.


Rick