Date: Wed, 23 Jun 2004 17:45:56 +0300 From: Maxim Sobolev <sobomax@portaone.com> To: =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no> Cc: freebsd-current@freebsd.org Subject: Re: HostRaid support on FreeBSD Message-ID: <40D997A4.9050900@portaone.com> In-Reply-To: <xzpoenanz2t.fsf@dwp.des.no> References: <5.2.1.1.0.20040621135534.068fef40@server01.chassis00.xsnetworks.net> <40D7E0B7.1000905@portaone.com> <40D8D217.5000808@freebsd.org> <40D95FDC.9060802@portaone.com> <xzpoenanz2t.fsf@dwp.des.no>
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Dag-Erling Smørgrav wrote: > Maxim Sobolev <sobomax@portaone.com> writes: > >>Well, my knowelege about internals of software RAID controllers is >>quite limited, but as long as I know they are no more than BIOS with >>UI for setting up RAIDs and interface to main BIOS that hides internal >>RAID structure allowing to boot off the RAID. Also they provide some >>persistent storage for RAID configuration, I assume either in some >>controller's NVRAM or on the HDDs. > > > The configuration is always stored on-disk, otherwise it wouldn't be > possible to recover from controller failure. > > >>Therefore, the same set of GEOM >>RAID modules can work with different software RAID controllers (SCSI, >>ATA, SATA etc) if there will be a standard way to extract this info >>from the controller's driver, and present it in some common >>format. That's what I am talking about. > > > You're kicking down open doors. This problem has already been solved > for Vinum, which is conceptually identical from a GEOM point of view. Nah. As I said there should be some standard way to extract RAID configuration info out of controller's driver in controller-independent format. -Maxim
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