Date: Wed, 20 Dec 2000 00:43:10 -0800 From: Mike Smith <msmith@freebsd.org> To: Andreas Klemm <andreas@klemm.gtn.com> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: Promise FASTtrak66/RAID1 working? Message-ID: <200012200843.eBK8hAQ15607@mass.osd.bsdi.com> In-Reply-To: Your message of "Wed, 20 Dec 2000 08:52:44 %2B0100." <20001220085244.A17156@titan.klemm.gtn.com>
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> On Fri, Dec 15, 2000 at 09:46:35PM -0600, Michael C . Wu wrote:
> > On Fri, Dec 15, 2000 at 04:25:24PM -0800, James scribbled:
> > | On Fri, Dec 15, 2000 at 04:21:41PM -0800, Mike Smith wrote:
> > | > > I understand that FreeBSD 4.2 (and before) does not support
> > | > > the Promise FASTtrak66 in a RAID setup. But being one that
> > | > > likes to see things for himself, I tried it out.
> > | >
> > | > Actually, FreeBSD does support these cards in 4.2.
> >
> > Use the ar0 if you want the RAID to work, and setup your ar0
> > configuration in the Promise card's BIOS.
>
> The manpage doesn't mention the RAID controller to be supported.
> Is there a webpage containing information, what functionality
> one may expect from RAID mode ???
No, there isn't. Basically, you can't really expect much; I don't even
think that failure of one drive in a mirror will be handled correctly.
> Is it mainly the controller, who does this job ?
No, it's all done by the driver.
> Would it then be possible, to install Win2000 and FreeBSD
> on the same mirrored set of disks ?
This is probably feasible.
> What if a failure occurs ? Does it automatically switch over
> to use the remaining drive without having to do something
> immediately ?
No; from my reading of the code, you'll get a lot of disk error messages.
The system may fail.
> When does recovery takes place ? Do I simply have to
> powerdown the machine and replace the bad disk and the
> controller automatically recovers the harddisks ? Even
> if drive 0 was bad ? Does it boot then from drive 1 and
> does recovery in the background ?
None of this is done.
If you want ATA RAID, get a 3ware controller. End of story.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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