FAQ
Guys,

The other day while working on my old workstation it get frozen and
after reboot I lost almost all data unexpectedly.

I have a RAID1 configuration with LVM. 2 IDE HDDs.

md0 .. store /boot (100MB)
--------------------------
/dev/hda2
/dev/hdd1

md1 .. store / (26GB)
/dev/hda3
/dev/hdd2

The only info that still rest in was that, that I restore after the
fresh install. It seems that the disk were with problems and weren't
syncing :(. I confessed, I didn't check that at first time but after I
lost the data and check /var/log/messages I saw that.
From /var/log/messages
...
Jan 17 12:22:15 zion kernel: md: raid1 personality registered for level 1
Jan 17 12:22:15 zion kernel: device-mapper: ioctl: 4.11.0-ioctl
(2006-09-14) initialised: dm-devel@redhat.com
Jan 17 12:22:15 zion kernel: md: Autodetecting RAID arrays.
Jan 17 12:22:15 zion kernel: md: invalid raid superblock magic on hda3
Jan 17 12:22:15 zion kernel: md: hda3 has invalid sb, not importing!
Jan 17 12:22:15 zion kernel: md: autorun ...
Jan 17 12:22:15 zion kernel: md: considering hdd2 ...
Jan 17 12:22:15 zion kernel: md: adding hdd2 ...
Jan 17 12:22:15 zion kernel: md: hdd1 has different UUID to hdd2
Jan 17 12:22:15 zion kernel: md: hda2 has different UUID to hdd2
Jan 17 12:22:15 zion kernel: md: created md1
Jan 17 12:22:15 zion kernel: md: bind<hdd2>
Jan 17 12:22:15 zion kernel: md: running: <hdd2>
Jan 17 12:22:15 zion mcstransd: mcstransd starting
Jan 17 12:22:15 zion kernel: raid1: raid set md1 active with 1 out of 2 mirrors
Jan 17 12:22:15 zion kernel: md: considering hdd1 ...
Jan 17 12:22:15 zion kernel: md: adding hdd1 ...
Jan 17 12:22:15 zion kernel: md: adding hda2 ...
Jan 17 12:22:15 zion kernel: md: created md0
Jan 17 12:22:15 zion kernel: md: bind<hda2>
Jan 17 12:22:15 zion kernel: md: bind<hdd1>
Jan 17 12:22:15 zion kernel: md: running: <hdd1><hda2>
Jan 17 12:22:15 zion kernel: md: kicking non-fresh hdd1 from array!
Jan 17 12:22:15 zion kernel: md: unbind<hdd1>
Jan 17 12:22:15 zion kernel: md: export_rdev(hdd1)
Jan 17 12:22:15 zion kernel: raid1: raid set md0 active with 1 out of 2 mirrors
Jan 17 12:22:15 zion kernel: md: ... autorun DONE.
...

This computer is really old, Celeron 800MHz, 256MB of RAM and IDE disk too.

I know that I have to suffer the consequences but if you know some way
to recover some data, help me please.

These days I have been reading about: mdamd, and some way to recover
but no success:

I tried to boot from rescue mode with CentOS 5 first CD and do an fsck
to /dev/hda3 and /dev/hdd2. After this something about superblock was
told to me and that use the command e2fsck -b 8123 <device> (I don't
remember the number exactly) but no success either.

Do you have some idea ?

Thanks guys,

Cheers,
al.

Search Discussions

  • William L. Maltby at Jan 18, 2008 at 8:23 pm

    On Fri, 2008-01-18 at 15:01 -0500, Alain Reguera Delgado wrote:
    Guys,

    The other day while working on my old workstation it get frozen and
    after reboot I lost almost all data unexpectedly.

    I have a RAID1 configuration with LVM. 2 IDE HDDs.

    md0 .. store /boot (100MB)
    --------------------------
    /dev/hda2
    /dev/hdd1

    md1 .. store / (26GB)
    /dev/hda3
    /dev/hdd2

    The only info that still rest in was that, that I restore after the
    fresh install. It seems that the disk were with problems and weren't
    syncing :(. I confessed, I didn't check that at first time but after I
    lost the data and check /var/log/messages I saw that.
    From /var/log/messages
    ...
    Jan 17 12:22:15 zion kernel: md: raid1 personality registered for level 1
    Jan 17 12:22:15 zion kernel: device-mapper: ioctl: 4.11.0-ioctl
    (2006-09-14) initialised: dm-devel@redhat.com
    Jan 17 12:22:15 zion kernel: md: Autodetecting RAID arrays.
    Jan 17 12:22:15 zion kernel: md: invalid raid superblock magic on hda3
    Jan 17 12:22:15 zion kernel: md: hda3 has invalid sb, not importing!
    Jan 17 12:22:15 zion kernel: md: autorun ...
    Jan 17 12:22:15 zion kernel: md: considering hdd2 ...
    Jan 17 12:22:15 zion kernel: md: adding hdd2 ...
    Jan 17 12:22:15 zion kernel: md: hdd1 has different UUID to hdd2
    Jan 17 12:22:15 zion kernel: md: hda2 has different UUID to hdd2
    Jan 17 12:22:15 zion kernel: md: created md1
    Jan 17 12:22:15 zion kernel: md: bind<hdd2>
    Jan 17 12:22:15 zion kernel: md: running: <hdd2>
    Jan 17 12:22:15 zion mcstransd: mcstransd starting
    Jan 17 12:22:15 zion kernel: raid1: raid set md1 active with 1 out of 2 mirrors
    Jan 17 12:22:15 zion kernel: md: considering hdd1 ...
    Jan 17 12:22:15 zion kernel: md: adding hdd1 ...
    Jan 17 12:22:15 zion kernel: md: adding hda2 ...
    Jan 17 12:22:15 zion kernel: md: created md0
    Jan 17 12:22:15 zion kernel: md: bind<hda2>
    Jan 17 12:22:15 zion kernel: md: bind<hdd1>
    Jan 17 12:22:15 zion kernel: md: running: <hdd1><hda2>
    Jan 17 12:22:15 zion kernel: md: kicking non-fresh hdd1 from array!
    Jan 17 12:22:15 zion kernel: md: unbind<hdd1>
    Jan 17 12:22:15 zion kernel: md: export_rdev(hdd1)
    Jan 17 12:22:15 zion kernel: raid1: raid set md0 active with 1 out of 2 mirrors
    Jan 17 12:22:15 zion kernel: md: ... autorun DONE.
    ...

    This computer is really old, Celeron 800MHz, 256MB of RAM and IDE disk too.

    I know that I have to suffer the consequences but if you know some way
    to recover some data, help me please.

    These days I have been reading about: mdamd, and some way to recover
    but no success:

    I tried to boot from rescue mode with CentOS 5 first CD and do an fsck
    to /dev/hda3 and /dev/hdd2. After this something about superblock was
    told to me and that use the command e2fsck -b 8123 <device> (I don't
    remember the number exactly) but no success either.

    Do you have some idea ?
    I've not used raid, but your file system is inside LVM, from what you
    say. You need to have LVM active and fsck on /dev/<your logical vol> for
    fsck to work.

    Thanks guys,

    Cheers,
    al.
    <snip sig stuff>
    HTH
    --
    Bill

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