Date: Tue, 27 Apr 2010 14:40:47 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Gavin Atkinson <gavin@FreeBSD.org> Cc: freebsd-current@FreeBSD.org, freebsd-geom@FreeBSD.org Subject: Re: Switchover to CAM ATA? Message-ID: <4BD6CD3F.5080903@FreeBSD.org> In-Reply-To: <1272367989.97887.47.camel@buffy.york.ac.uk> References: <4BD06BD9.6030401@FreeBSD.org> <20100426.103327.319083499807534535.imp@bsdimp.com> <1272367989.97887.47.camel@buffy.york.ac.uk>
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Gavin Atkinson wrote: > Losing ataraid would be bad. I suspect there are a lot of installs > using it - especially as there is no way to create any other mirror from > sysinstall. However, I'm not actually sure that the functionality it > provides is easy to push down into GEOM. > > ataraid depends on knowing a lot about the underlying hardware, in order > to know which format of metadata to use. i.e. it needs to know that the > disks are attached to (say) a Highpoint controller. This is especially > important when creating new ATA RAID devices, although there is so > little identifying metadata on the disks themselves that in some cases > it doesn't look like it is possible to identify or even confirm the > existence of metadata without knowing the PCI ID of the controller to > which the disks are attached. > > I'm not sure I can see a way to do this from within GEOM. CAM allows every SIM driver to report several arbitrary string values, describing driver and hardware. They are almost unused now. I don't see much problems in exporting them to GEOM and making tasting method to analyze them. -- Alexander Motin
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