Date: Tue, 14 Dec 2004 07:58:53 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Doug White <dwhite@gumbysoft.com> Cc: freebsd-stable@freebsd.org Subject: Re: drive failure during rebuild causes page fault Message-ID: <41BE8F2D.8000407@DeepCore.dk> In-Reply-To: <20041213183336.T97507@carver.gumbysoft.com> References: <20041213052628.GB78120@meer.net> <20041213054159.GC78120@meer.net> <20041212215841.X83257@carver.gumbysoft.com> <20041213060549.GE78120@meer.net> <20041213102333.V92964@carver.gumbysoft.com> <20041213192119.GB4781@meer.net> <20041213183336.T97507@carver.gumbysoft.com>
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Doug White wrote: > On Mon, 13 Dec 2004, Joe Rhett wrote: >=20 >=20 >>>This is why I don't trust ATA RAID for fault tolerance -- it'll save y= our >>>data, but the system will tank. Since the disk state is maintained by= >>>the OS and not abstracted by a separate processor, if a disk dies in a= >>>particularly bad way the system may not be able to cope. >> >>Yes, but SATA isn't limited by this problem. It does have a processor = per >>disk. (this is all SATA, if I didn't make that clear) >=20 > Actually on SATA its worse -- the disk just stops responding to everyth= ing > and hangs. If you don't detect this condition then you go into an > infinite wait. >=20 > In any case, yes the ATA RAID code could use a massive robustness pass.= So > could the core ATA code. Patches accepted :) Actually I'm in the process of rewriting the ATA RAID code, so things=20 are rolling, albeit slowly, time is a precious resource. I belive that=20 it can be made pretty robust, but the rest of the kernel still have=20 issues with disappearing devices etc thats out of ATA's realm. Anyhow. I can only test with the HW I have here in the lab, which by far = covers all possible permutations, so testing etc by the community is=20 very much needed here to get things sorted out... --=20 -S=F8ren
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