Date: Thu, 6 May 2004 02:22:18 -0700 From: David Schultz <das@FreeBSD.ORG> To: Scott Long <scottl@FreeBSD.ORG> Cc: iso-8859-1?Q?S=F8ren?= Schmidt <sos@DeepCore.dk> Subject: Re: Updated SATA support patches for Intel ICH & Promise cards Message-ID: <20040506092218.GA30797@VARK.homeunix.com> In-Reply-To: <40994C5C.1050904@freebsd.org> References: <200405041825.i44IPgVa021573@ambrisko.com> <4097F9EA.1080904@DeepCore.dk> <20040505124349.GA612@VARK.homeunix.com> <40990479.6070809@DeepCore.dk> <20040505194949.GA2443@VARK.homeunix.com> <40994763.4090203@DeepCore.dk> <20040505200911.GA2752@VARK.homeunix.com> <40994C5C.1050904@freebsd.org>
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On Wed, May 05, 2004, Scott Long wrote: > David Schultz wrote: > >On Wed, May 05, 2004, Sren Schmidt wrote: > > > >>David Schultz wrote: > >> > >>>I have two SATA drives that are mirrored via ccd(4). The > >>>mirroring apparently introduced some sort of race that led to > >>>problems, which started when ATAng was committed. The specific > >>>symptoms changed as the ata driver evolved, and varied from kernel > >>>panics in the best case and data corruption in the worst case. > >>>But the details of the problem aren't as important as the fact > >>>that some aspect of Doug's patch fixes them! > >> > >>Have you considered using atacontrol to create an ATA RAID instead ? > >>Does that work ? on an unpatched kernel ? > > > > > >This is an Intel 875P motherboard, and I think the controller only > >supports striping, not mirroring. If this is not the case, I'd > >happily try it, although it would take a while for me to find the > >time to back up and migrate my data if there are any > >incompatibilities. > > The ICH5 controller on the southbridge has no concept of RAID. It's > just a SATA/IDE controller. Your motherboard might have a BIOS that > understands striping and/or mirroring the two SATA disks, but that is > a purely software function and has nothing to do with the disk > controllers. > > I find with much chagrin how effective the marketing campaigns are for > software RAID these days ;-) Heh. When I bought the motherboard, the documentation claimed it supported RAID 0. I didn't care about RAID 0 so I didn't investigate further. I just checked Intel's website, and it appears that that selfsame motherboard now supports RAID 0 *and* RAID 1. I guess that just means Intel's newer BIOSes have boot-time support for mirroring. The scumbags don't mention anywhere that this is software RAID...
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