Date: Mon, 23 Feb 1998 14:17:20 -0600 (CST) From: Roger P Johnson <hirsh@skypoint.com> To: questions@FreeBSD.ORG Subject: corrupt root files system; How to boot from CDROM for fixing ? Message-ID: <199802232017.OAA09515@mirage.skypoint.com>
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Hi and help!
My root file system is corrupted.
Something happend during the night, and when I came in this morning the
system booted up into the /stand/sysinstall program.
Rebooting, here is what I get:
changing root device to sd0a
WARNING: / was not properly dismounted.
exec /sbin/init: error 20
exec /sbin/oinit: error 20
exec /sbin/init.bak: error 20
/stand/sysinstall running as init
Ok. I try the fixit option. fixit cannot mount the fixit floppy nor the
2nd cdrom.
Apprarently sysinstall has mounted the root device only, and the root
partition looks pretty shaky and I cannot change anything to write mode.
I have no mount and umount commands to mount the other partions.
I ran fsck -n over all my partions and they only complain about not being
unmounted properly (all right!).
Running fsck -n over the root partion yields all kinds of inodes missing
and other ugly junk.
System:
DEC Venturis FX5100 (100 MHz Pentium)
Adaptec 2940
SCSI ID 0: Seagate Hawk 2XL ST32151N
SCSI ID 2: Tanberg Tape Drive
SCSI ID 3: Plextor 4Plex Plus 4xCDROM
FreeBSD 2.2.2
OK. Here are a couple of questions on how to fix this:
Q1: How do I boot from the bootable cdrom ? I did this once when I didn't
want to, before FBSD was installed on the hard drive. I have tried
all kinds of combonations, trying to boot from the cdrom to no avail.
[By combonations, I mean trying:
typing "3:cd0(0,a)kernel" or "3:cd0/kernel" or "3:cd0"
at the boot prompt
also setting the BIOS to boot from cdrom then hard disk and
enable booting from cd-rom in the Adaptec setup]
This way, I could mount the the other partions, make a backup copy of
them, and then do a restore of the root partion from a prior backup
tape of the root filesystem; reboot and wholla ?
Q2: Can I do a re-install of FBSD, using the old partion table and just
install the core stuff on /, /usr and /var ? Will the installation
overwrite my other partions on /home, /u, /source and will they be
lost or just as they where ?
Q3: Can I cpio the whole partions to tape, re-install using the exact
same filesystem sizes and restore the partion from the tape ?
I am having a hard time cpio'ing say /dev/sd0s2e to tape, if this
is even possible. I am missing dump also.
Any help is much apprieciated,
Roger
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