raid/lvm restore question

From: Dave (dspear99ca_at_yahoo.delete.com)
Date: 05/28/04

  • Next message: Dave: "Re: raid/lvm restore question" 
    Date: Fri, 28 May 2004 19:19:00 GMT

    I have the following situation:

    I screwed up my RH9 2.4.25 (heavily patched) config by "updating" the
    linux-wlan-ng driver for my wireless NIC. I had been seeing transient
    networking errors and, well, it seemed like a pretty safe bet. 8-(.
    Apparently the "new" driver install script does not clean up the old
    drivers... I've found a few extraneous files around and don't have the
    patience to sift through and find all the problem children. AT ANY RATE, I
    can boot to single user, force the correct drivers to install, and all is
    well.

    No problem, says I with a well-deserved pat on the back... I do backups
    nightly. I'll just restore "/" from last week's DLT full.

    Well, maybe I shouldn't overwrite my current, broken-yet-functional,
    installation...

    Now, root is on a logical volume '/dev/Volume00/RootVol' which is on a
    software RAID-5 array, '/dev/md1'. Complicated for restoring. So I boot
    off of cd, start my raid volumes, activate my volume groups, and create a
    new logical volume I call '/dev/Volume00/TempVol'. Aha, I can mount it. So
    I restore '/' from tape, all is good. It's all there. I change
    "/etc/fstab" to reflect the new root location '/dev/Volume00/TempRoot'. I
    change "/etc/lilo.conf" and run lilo and reboot.

    I get so far in booting the kernel. When it tries to mount root I get
    errors such as "corrupt superblock on /dev/Volume00/TempRoot... run
    e2fsck -b 8193 blah blah blah." Drops me into a shell. I run pvscan, yup,
    there's /dev/md1 with VG "Volume00". I run vgscan, whoops, no volumes
    found. Hmm, let's try "vgchange -a y /dev/Volume00". Error, "Raid device
    /dev/md1 is inconsistent".

    So, what am I doing wrong here. Obviously the device '/dev/md1' is okay, I
    can still boot my broken installation no complaints. Is there anywhere
    other than /etc/fstab and lilo that need updating?

    Thanks

    Dave

  • Next message: Dave: "Re: raid/lvm restore question"

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