Re: 2.4.21-pre4: PDC ide driver problems with shared interrupts

From: Edward King (
Date: Tue Jul 22 2003 - 09:44:10 EST


Quick fix to the problem is remove devfs -- it appears that the devfs
code doesn't like to have the raid layered on top of it, and it loses

I've got two systems now running 4 200GB WD's connected to a single
promise card (ATA100/TX2) with the booting drive (a 5th drive) attached
to the motherboard. The raid works flawlessly and is fast -- I imagine
there'd be a speedup by keeping all the drives as master (with 2 pdc's)
and it would be more robust, but those aren't issues.

Hope this helps -- I'll post this to the mailing list to help anyone
else with this problem.

- Ed

John V. Martinez wrote:

> Hi Ed,
> I found a linux-kernel post you made back in March about problems
> running two Promise IDE controllers in the same system. I have a
> similar configuration, (and a similar problem,) and I was wondering if
> you ever found a solution, or if one of the more recent 2.4.21-foo
> kernels solved it for you.
> (I have two Promise ATA-100/TX2 (20268 chip) controllers, and I have
> one 200GB WD drive as a single master on each channel. The two
> controllers are sharing interrupts with othwer cards, but not with
> each other. I can access each disk individually, but when I tried to
> make them work hard: mkraid a RAID5 array using these four drives, the
> system freezes HARD until I hit the big red button. [Then it reboots,
> spots the raid superblock, tries to rebuild my RAID5 array, and
> freezes again, until I get a clue and unplug the drives in question
> while powered down :^))
> Anyway, if you have any more insight into this problem than you did in
> March, and care to share, I'd be much obliged.
> Cheers,
> -(-- John

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