Hi all,

this morning my desktop booted with errors. I repeatedly ran fsck
and rebooted. It finally booted directly into grub. Look:

grub rescue> ls
(md/1) (md/2) (md/0) (hd0) (hd0/msdos3) (hd/msdos2) (hd0/msdos1) (hd1)
(hd1,msdos3) (hd1,msdos2) (hd1,msdos1)

grub rescue> ls (md0,1)
error: unknown filesystem

Trying "ls" on them all gives "error: unknown filesystem" except for
some windows FS. The problem is, the only windows i have there is
running inside a virtualbox. I cannot boot it from grub.

I dont know how to go further ... any help?

It is a raid level 2 (see on the md points) under ubu 12.04.

thx a lot for any help ...

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On Tue, Aug 7, 2012 at 6:56 AM, oxy <oxyopes@googlemail.com> wrote:
>
> this morning my desktop booted with errors. I repeatedly ran fsck
> and rebooted. It finally booted directly into grub. Look:
>
> grub rescue> ls
> (md/1) (md/2) (md/0) (hd0) (hd0/msdos3) (hd/msdos2) (hd0/msdos1) (hd1)
> (hd1,msdos3) (hd1,msdos2) (hd1,msdos1)
>
> grub rescue> ls (md0,1)
> error: unknown filesystem
>
> Trying "ls" on them all gives "error: unknown filesystem" except for
> some windows FS. The problem is, the only windows i have there is
> running inside a virtualbox. I cannot boot it from grub.
>
>
> It is a raid level 2 (see on the md points) under ubu 12.04.

It's not raid2. Probably raid1.

The "msdos..." simply means that you have BIOS disks.

What's the output of "set" at the "grub rescue" prompt?

On which of these partitions is "/boot/grub"?

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> It's not raid2. Probably raid1.
correct

> What's the output of "set" at the "grub rescue" prompt?
i did:
grub rescue>set prefix=(hd0,msdos1)/boot/grub
grub rescue>set root=(hd0,msdos1)
grub rescue>insmod normal
grub rescue>normal

He takes the "set" commands silently but does not understand
the "normal" command.

I just booted with the ubu CD and trying to mount the partition home
in order to make a backup. The mount command replies:
"mount: unknown filesystem type linux_raid_member"

How can i mount that?

thx a lot really ...

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On Tue, Aug 7, 2012 at 8:41 AM, oxy <oxyopes@googlemail.com> wrote:


>> What's the output of "set" at the "grub rescue" prompt?
>
> i did:
> grub rescue>set prefix=(hd0,msdos1)/boot/grub
> grub rescue>set root=(hd0,msdos1)
> grub rescue>insmod normal
> grub rescue>normal

It should've been "insmod normal.mod" (I think).


> I just booted with the ubu CD and trying to mount the partition home
> in order to make a backup. The mount command replies:
> "mount: unknown filesystem type linux_raid_member"
>
> How can i mount that?

You have to install mdadm and activate the array before mounting it.

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