Expand nonraid to raid

Brandon Ooi brandono at gmail.com
Wed Apr 21 12:56:10 CDT 2010


On Wed, Apr 21, 2010 at 2:03 AM, Stroller
<stroller at stellar.eclipse.co.uk> wrote:
>
> On 21 Apr 2010, at 09:41, Tino Schwarze wrote:
>>
>> As far as I know, this is not possible since any RAID setup will need
>> some bytes of Metadata at the start or end of a partition/device.
>
> I understood there was some 50 bytes or so in the first sector of the
> hard-drive that was unallocated in the conventional disk layout, and
> that RAID systems typically put their metadata in there.
>
> Magnus: you may be able to determine this by creating a RAID1 and then
> comparing an fdisk of it with the fdisk of the existing drive. If it
> has the same number of bytes (or more) then you can boot from a LiveCD
> and clone using dd (or GNU ddrescue).
>
> Stroller.
>

I believe megaraid controllers put raid metadata at the end. That's
why it's possible to recover data from a raid 1 drive without the raid
controller. Partitions and filesystems are detected when connected as
regular drives.



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