How to troubleshoot a frozen boot sequence
billy at nlcc.us
Fri Jan 22 18:20:49 UTC 2010
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.
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.
/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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