Date: Fri, 22 Jan 2010 11:53:31 -0600 From: Billy Newsom <billy@nlcc.us> To: freebsd-questions@freebsd.org Subject: How to troubleshoot a frozen boot sequence Message-ID: <4B59E61B.3090504@nlcc.us>
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I am doing a test run on a production server. It has 2 hard drives. ad0 (mounted on /disk250 in a single slice plus SWAP) twed0 (mounted on / /var /usr and a SWAP) The twed0 is a hardware mirror and my main drive. ad0 is just for backups. What the issue is, and you probably know where I'm heading. The boot process freezes if I remove the ad0 (to test a drive failure condition) It freezes after saying: BTX boot loader.... etc. FreeBSD/i386 bootstrap loader 1.1 It spins for a second, then stops... unless I have ad0 in the computer. /boot/kernel/kernel text=0x7b03a0 data=0xcdee0 / And it never gets to the boot menu. So: 1. Should I put a new boot0config on the twed0 drive? If so do I boot from a CD to do that? I need to potentially do something also to my disk labels and my fstab so that I don't boot to single user mode if drive ad0 fails. I haven't done this exact type of thing before, so I am looking for a little help. my fstab: /dev/ad0s1b none swap sw 0 0 /dev/twed0s1b none swap sw 0 0 /dev/twed0s1a / ufs rw 1 1 /dev/ad0s1d /disk250 ufs rw 2 2 /dev/twed0s1e /tmp ufs rw 2 2 /dev/twed0s1f /usr ufs rw 2 2 /dev/twed0s1d /var ufs rw 2 2 /dev/acd0 /cdrom cd9660 ro,noauto 0 0 I tried to read the MBR from the twed0 drive, and the program couldn't read it. The one from the ad0 drive is readable and I saved a copy of it.
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