Re: GPT Table broken on a Raid1

[John Robinson <john.robinson@anonymous.org.uk>]

On 21/09/2012 23:43, Chris Murphy wrote:
>
> On Sep 21, 2012, at 1:35 PM, Chris Murphy wrote:
>
>> If you're making the RAID with that, it defaults to metadata version 1.2. But to be sure
>> mdadm -E /dev/mdX
>
> Scratch that. I was confused. Try these instead:
>
> mdadm -–detail-platform
> mdadm –D /dev/md/imsm
> mdadm –E /dev/sdX

I don't think there's anything wrong here.

The kernel sees the whole discs, sda and sdb, and complains that the GPT 
partition table looks wrong becase the second copy isn't at the end of 
the discs. That's correct, at the end of the raw discs is the IMSM 
metadata. Once you've assembled the IMSM array with mdadm, the partition 
table inside /dev/md/Volume0 is correct.

You'd see the same thing with a native md device with metadata 0.90 or 
1.0 made from whole discs and with a GPT partition table inside.

Don't try to change the partition tables on /dev/sda and sdb or you will 
damage the IMSM metadata.

Cheers,

John.

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