Date: Fri, 26 Oct 2012 09:33:38 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: schmidt@ze.tum.de Cc: freebsd@edvax.de, freebsd-questions@freebsd.org Subject: Re: ata controller problem Message-ID: <20121026163338.GA32286@icarus.home.lan>
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Regarding this: http://lists.freebsd.org/pipermail/freebsd-questions/2012-October/245862.html No no NO *NO*! I wish people would stop recommending this utter garbage. There is absolutely no justification behind using the highly convoluted labelling mechanisms at multiple layers within FreeBSD. There are 3 (possibly 4) different "label" mechanisms which do nothing but confuse the user, or cause other oddities/complexities. Good grief, there is so much hard evidence on the mailing lists over the past 5 (maybe even 7?) years talking about the utter mess that is filesystem/device/geom/blahblah labels that to recommend this is borderline insane. The proper way to solve this problem is to user /boot/loader.conf tie-downs to assign each disk to each individual controllers' device number (e.g. ada0 --> scbus0 --> ahcich0, or whatever you want). Please note I said ahcichX, not ahciX. Different things. I have helped others in the past do this; Randy Bush is one such person. Taken directly from my /boot/loader.conf with a single SATA controller, but obviously this can be adjusted to whatever you want. # "Wire down" device names (ada[0-5]) to each individual port # on the SATA/AHCI controller. This ensures that if we reboot # with a disk missing, the device names stay the same, and stay # attached to the same SATA/AHCI controller. # http://lists.freebsd.org/pipermail/freebsd-fs/2011-March/011036.html # hint.scbus.0.at="ahcich0" hint.scbus.1.at="ahcich1" hint.scbus.2.at="ahcich2" hint.scbus.3.at="ahcich3" hint.scbus.4.at="ahcich4" hint.scbus.5.at="ahcich5" hint.ada.0.at="scbus0" hint.ada.1.at="scbus1" hint.ada.2.at="scbus2" hint.ada.3.at="scbus3" hint.ada.4.at="scbus4" hint.ada.5.at="scbus5" See CAM(4) man page (read it, don't skim!) for full details. Just please for the love of god do not use labels to solve this. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |
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