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Subject: Re: IDE DMA Problems...system hangs
To: jsidhu@arraycomm.com (Jasmeet Sidhu)
Date: Wed, 14 Feb 2001 20:28:27 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <5.0.2.1.2.20010214115941.02471bb8@pop.arraycomm.com> from "Jasmeet Sidhu" at Feb 14, 2001 12:09:39 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Anybody else having these problems with a ide raid 5?
> The Raid 5 performance should also be questioned..here 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 
> AT THIS POINT *

Ok thats a reasonable behaviour, except it shouldnt have then hung.
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