software raid question 2

[David A. Bandel]

On Fri, Aug 8, 2008 at 3:41 PM, Vu Pham <vu at sivell.com> wrote:
> Lonni J Friedman wrote:
>>
>> Is the array mounted?
>> Is the array alive?
>>
>> What's the output from "cat /proc/mdstat" when the problem is present?
>
> It was right after a fresh installation of that server. /dev/sdb, /dev/sdc
> and /dev/sdd may have some old information on that, but none of them was
> used at all after that installation.

If they had a md raid block on them, that would have to be zeroed
before you could reuse the disks in a raid.  mdadm will see those
superblocks and give you the error you describe.

wipe the drive, don't just play with the partitions.

>
> Reboot didn't fix the problem. Reboot and deleting /dev/md0 and recreating
> /dev/md0 fix the problem. I doubt that it is the right way to do so I will
> delete them, and try again.
>
> I forgot to check /proc/mdstat. You can see that I am new to mdadm. Will
> check that file when I get into problem again.
>
> Thanks,
>
> Vu
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Ciao,

David A. Bandel
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