Date: Tue, 15 Jan 2013 16:30:05 GMT From: Allen Landsidel <landsidel.allen@gmail.com> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/166589: atacontrol(8) incorrectly treats RAID10 and 0+1 the same Message-ID: <201301151630.r0FGU5UA043281@freefall.freebsd.org>
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The following reply was made to PR bin/166589; it has been noted by GNATS. From: Allen Landsidel <landsidel.allen@gmail.com> To: Alexander Motin <mav@FreeBSD.org> Cc: bug-followup@FreeBSD.org Subject: Re: bin/166589: atacontrol(8) incorrectly treats RAID10 and 0+1 the same Date: Tue, 15 Jan 2013 11:26:43 -0500 Holy crap. The PR is about hardware raid controllers and their interface with atacontrol, not ataraid. On 1/15/2013 11:25, Alexander Motin wrote: > At what point have we talked about hardware RAID controllers? ataraid(8) > never controller hardware RAID controllers, but only Soft-/Fake-RAIDs > implemented by board BIOS'es during boot and OS drivers after that. > > On 15.01.2013 18:22, Allen Landsidel wrote: >> Your solution then is to require everyone use software raid on their >> hardware raid controllers? >> >> On 1/15/2013 11:20, Alexander Motin wrote: >>> On 15.01.2013 18:03, Allen Landsidel wrote: >>>> I'm also extremely interested to hear how you intend to "handle it as >>>> RAID10 at the OS level" since that is, in fact, impossible. >>> Easily! >>> >>>> If it's a RAID0+1 in the controller, than it's a RAID0+1. Period. The >>>> OS can't do anything about it. A single disk failure is still knocking >>>> half the array offline (the entire failed RAID-0) and you are left with >>>> a functioning RAID-0 with no redundancy at all. >>> ataraid(8) in question (and its new alternative graid(8)) controls >>> software RAIDs. It means that I can do anything I want in software as >>> long as it fits into existing on-disk metadata format. If RAID BIOS >>> wants to believe that two failed disks of four always mean failed array >>> -- it is their decision I can't change. But after OS booted nothing will >>> prevent me from accessing still available data replicas. >>> >>>> On >
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