Question of retrieving data from a mirrored drive.

Michael Duffy cosgrach at
Tue Dec 6 01:42:56 UTC 2005

Les Mikesell wrote:
> On Mon, 2005-12-05 at 17:02, Michael Duffy wrote:
>>In the Redhat 4 'message' log, I see that it recognised the drive as a
>>mirror and went looking for it's other half.
> The only time it should do this is when you reboot the machine.

Correct, this only happened during a reboot.

> Finding the other half or not should have no effect on mounting,
> which it won't do automatically in either case.

I agree, it should not.

> If it was really RAID1 you should be able to mount the hdcn partions
> directly.  If the kernel detected the md devices at bootup you
> may also be able to mount them as 'broken' mirrors which also work
> fine.  A 'cat /proc/mdstat' should show the detected md devices.
> What command are you using to mount and how does it fail?

I am not at the machine at the moment, but I will give it a whirl when I 
get home.

The command that I used was: mount -t ext2 /dev/hdc# /mnt2

Where # = 1, 2, 3, or 4

I don't remember the *exact* error message.  I'd have to get back to you 
on that one.  Sorry.  This is the problem with not having it at hand 
when I ask the question.

How does one mount a 'broken' mirror?



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