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Bad magic number in super-block (urgent advice needed) - Linux Setup, Configuration & Administration

In article <vfo9vffip8oc87corp.supernews.com>, pablo wrote: > Dear Newsgroupers, > > On our school we have a mandrake 8.2 server running. Since yesterday we have > serious troubles. > We can only get into the system via failsafe. > > It seems the filesystem is corrupted and in dmesg we find the advise to do > e2fsck. > When we try that we get the message > "Bad magic number in super-block while trying to open. Could not find valid > filesystem superblock." > > How can you retrieve the superblock information. this is just general comment, from past experience. fsck ...

  1. #1

    Default Re: Bad magic number in super-block (urgent advice needed)

    In article <vfo9vffip8oc87corp.supernews.com>, pablo wrote:
    > Dear Newsgroupers,
    >
    > On our school we have a mandrake 8.2 server running. Since yesterday we have
    > serious troubles.
    > We can only get into the system via failsafe.
    >
    > It seems the filesystem is corrupted and in dmesg we find the advise to do
    > e2fsck.
    > When we try that we get the message
    > "Bad magic number in super-block while trying to open. Could not find valid
    > filesystem superblock." > > How can you retrieve the superblock information.
    this is just general comment, from past experience. fsck s/b able to
    find an alternate superblock w/o user intervention but it may be
    configured differently w/Mandrake. but if it cannot, you are toast,
    unless you have some 3rd party data recovery package.

    find a system that gets you a man page for fsck/e2fsck, even just
    a wintel box to use google, and figure out how to manually give
    fsck an alternate superblock. of course this assumes you know
    or can find out the offsets (there are several alt.sb's). i cannot
    help you w/that. good luck, --LOren
    >
    > And could a raid-controller faillure (Adaptec raid-controllers) be the cause
    > of that?
    > If so, how can you find the configuration of the raid devices?
    >
    > TIA,
    >
    > pablo k
    >
    >
    >
    Loren Coe Guest

  2. #2

    Default Re: Bad magic number in super-block (urgent advice needed)

    pablo wrote:
    > It seems the filesystem is corrupted and in dmesg we find the advise to do
    > e2fsck.
    > When we try that we get the message
    > "Bad magic number in super-block while trying to open. Could not find
    > valid filesystem superblock."
    ..... have you tried using badblocks then run fsck?

    --
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~
    Michael J. Tobler: motorcyclist, surfer, # Black holes result
    skydiver, and author: "Inside Linux", # when God divides the
    "C++ HowTo", "C++ Unleashed" # universe by zero

    mjt Guest

  3. #3

    Default Re: Bad magic number in super-block (urgent advice needed)


    Are you fscking the correct device? Is it possible you're not specifying the
    correct file system type (ie.n ext3, xfs)?

    That failing, if you can't mount the device for backing up, you are pretty much
    S.O.L. Sorry.

    The next thing for you to do is figure out why and how it became corrupted.




    On Fri, 27 Jun 2003 13:17:20 +0200 "pablo" <pablokexeit.removethis.demon.nl>
    wrote:
    > Dear Newsgroupers,
    >
    > On our school we have a mandrake 8.2 server running. Since yesterday we have
    > serious troubles.
    > We can only get into the system via failsafe.
    >
    > It seems the filesystem is corrupted and in dmesg we find the advise to do
    > e2fsck.
    > When we try that we get the message
    > "Bad magic number in super-block while trying to open. Could not find valid
    > filesystem superblock."
    >
    > How can you retrieve the superblock information.
    >
    > And could a raid-controller faillure (Adaptec raid-controllers) be the cause
    > of that?
    > If so, how can you find the configuration of the raid devices?
    >
    > TIA,
    >
    > pablo k
    >
    >
    >

    --

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    Jerry McBride Guest

  4. #4

    Default Re: Bad magic number in super-block (urgent advice needed)

    Dear NGers,

    First of all, thanks for the given advice.

    We no longer assume that the raid controllers are the cause of our problems.

    With 'mk2efs -n' we got the information where the superblocks were
    positioned. We used that information in 'e2fsck -B xx', but without any
    success.
    We alse performed a 'badblocks' check but again without luck.

    When booting mandrake at some moment we get three messages that state there
    is no space for
    /bin/date
    /bin/uname
    /bin/cat

    Some time later we get the message that the space for /var is 0 and that
    amount is not the same as ????? (a value somewhere in the 50,000).
    At some point during the booting proces we see the message that
    'partmon' failed to start.

    Is there any hope we can revive our system without reinstalling it all??

    Is there any 3rd party software that could help us, like Partition Magic, or
    tomsrtbt??

    Tia,

    pablo k



    pablo Guest

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