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From: arisawa@ar.aichi-u.ac.jp
Subject: Re: [9fans] VIA VT8237 SATA/RAID i/o errors, dma doesnt work
Date: Wed,  6 Feb 2008 11:01:08 +0900
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Topicbox-Message-UUID: 47569ce4-ead3-11e9-9d60-3106f5b1d025

Hello,

I had a similar phenomenon with VB7001G using two SATAs(IDE mode).
Second SATA is unstable but I don't know where the problem comes from.
Plan 9 under single SATA(IDE mode) works fine.

Kenji Arisawa


On 2008/02/05, at 17:18, Kernel Panic wrote:

> Hello,
>
> I purchased an C7 based machine with VIA VT8237 SATA/RAID:
>
> http://www2.digitalo.de/
> deeplink.jsp;jsessionid=0FEFF78E7DE9EC893CD54A5B75AA7B60?
> PROD=948733&EXT=SHOPPING
>
> Have 2 SATA disks attached. They are detected like normal IDE devices.
> The Installation of Plan9 worked fine. Created partitions and #k
> mirror and setup
> venti. I wanted to copy the arenas of my old fileserver to it and
> then later format
> fossil with the last score, but the machine fails before finishing/
> reading the first
> arena. :-(
>
> First, i found that DMA was disabled for both drives, so i forced
> it on with:
> echo dma on >/dev/sdC0/ctl
> echo dma on >/dev/sdD0/ctl
>
> ...then i get i/o errors in venti and plan9 paniced. so this was
> not such a good idea i guess...
> reformated all venti partitions and tried again several times with
> different bios options
> (without DMA, tried both bios SATA IDE and SATA RAID mode):
>
> - after hours of disk activity, sdD0 failed... i tried to read /dev/
> sdD0/data and got i/o error instantly and
> after reboot worked again.
>
> - after hours of disk activity, i see i/o-error that it cant read /
> dev/sdD0/9hal.vtbloom
> (venti bloomfilter partition 64MB). and then crashed with poolpanic.
>
> http://plan9.bell-labs.com/wiki/plan9/Supported_PC_hardware/
> index.html shows that this
> controller should work but it doesnt for me currently.
>
> pci -v shows the as same ids as in the sdata.c driver.
>
> Is anybody using that sata controller? (with multiple SATA disks?)
> Do i miss here something?
> Are here any special BIOS options i need to get this working?
>
> cinap