Date: Sat, 3 Dec 2011 20:43:09 +0000 From: "b. f." <bf1783@googlemail.com> To: Rob <lists@midsummerdream.org>, freebsd-questions@FreeBSD.org Subject: Re: AHCI driver and static device names Message-ID: <CAGFTUwPofh9Vn3XK64WP_F3xoE%2BD4Jrum3FJ90EwhfUOwQ5HWw@mail.gmail.com>
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> I was getting ready to install the latest FreeBSD 9-RCs image, and I > found that 9 now defaults to using the ahci driver for sata disks. This > would be great if it weren't for the fact that the ahci driver seems to > do dynamic device name assignment as opposed to the static ones used > with the older drivers. > > I've looked around on google and while this is mentioned (in old > threads), the "solution" is to use labels or elaborate mapping via hints > which really aren't solutions imo. If I have 15 disks in an array, I > want to be able to label them and know which bay is which device name. > If I have to replace a drive, I have no idea what dynamic device name it > will have when it comes time to partition (and label, if I were using > that). I could probably figure it out by looking at what disks are used > on the system, but that's more work that it really should be. > > Is there a way to use the ahci driver and get static device names? cam(4) gives examples of how you can do this by using device hints in loader.conf(5) or device.hints(5). Another example: http://lists.freebsd.org/pipermail/freebsd-fs/2011-March/011036.html You may need the workaround from: http://svn.freebsd.org/changeset/base/227635 for some problematic BIOS. I'm not sure if this is what you meant by "hints which aren't really solutions", but they seem to be a practical method for fixing device names with ahci(4). b.
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