Re: IDE DMA Problems...system hangs

Alan Cox (
Wed, 14 Feb 2001 20:28:27 +0000 (GMT)

> Anybody else having these problems with a ide raid 5?
> The Raid 5 performance should also be are some number
> returned by hdparam

You will get horribly bad performance off raid5 if you have stripes on both
hda/hdb or hdc/hdd etc.

> Feb 13 05:23:27 bertha kernel: hdo: dma_intr: status=0x51 { DriveReady
> SeekComplete Error }
> Feb 13 05:23:27 bertha kernel: hdo: dma_intr: error=0x84 { DriveStatusError
> BadCRC }

You have inadequate cabling. CRC errors are indications of that. Make sure you
are using sufficiently short cables for ATA33 and proper 80pin ATA66 cables.

> Feb 13 12:12:42 bertha kernel: hdg: irq timeout: status=0x50 { DriveReady
> SeekComplete }
> Feb 13 12:13:02 bertha kernel: hdg: timeout waiting for DMA

This could be cabling too, cant be sure

> Feb 13 12:13:12 bertha kernel: hdg: DMA disabled

It gave up using DMA

> Feb 13 12:13:12 bertha kernel: ide3: reset: success <------- * SYSTEM HUNG

Ok thats a reasonable behaviour, except it shouldnt have then hung.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at