Date: Thu, 16 Sep 2010 11:29:33 +0200 From: Stefan Bethke <stb@lassitu.de> To: Michael Sperber <sperber@deinprogramm.de> Cc: freebsd-stable@freebsd.org Subject: Re: How to predict drive number change for 7.3->8.1 upgrade? Message-ID: <C8117F8C-DDAF-47A4-A723-71AAEA6E22FA@lassitu.de> In-Reply-To: <y9l7himgit9.fsf@deinprogramm.de> References: <y9l7himgit9.fsf@deinprogramm.de>
next in thread | previous in thread | raw e-mail | index | archive | help
Am 16.09.2010 um 11:05 schrieb Michael Sperber: > I just upgraded my desktop system from 7.3 to 8.1, and the main hard > drive, which was /dev/ad6 before is now /dev/ad10. Consequently, the > initial boot failed when trying to mount the root file system from = ad6. >=20 > The desktop system is now fixed, but I also have a rented server with > only a serial console, and I worry that the upgrade is going to leave = me > with a dead machine. Is there any way to predict how the drive number > changes? (Why does it change at all?) If so, what's the proper way = to > tell the system the initial root device *before* rebooting? If you have a serial console, you can always enter the root device at = the prompt, so you can recover there. If you can figure out the new device name, you can simply change the = fstab entry for /; that's where loader picks up the root device that it = hands to the kernel. Long-term, the best option is to label your filesystems or partitions, = and use the label entries in fstab instead of the device names. I don't = remember what 7.3 offers in terms of labels, but glabel should be = available. Check tunefs if it offers the -L volname option, that's even = better. Stefan --=20 Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?C8117F8C-DDAF-47A4-A723-71AAEA6E22FA>