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Subject: Re: Gpart and gmirror 8.2 from 18 januari
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On 19/01/2011 12:30, Johan Hendriks wrote:
> Hello all, i used to have disk configured with gpart and gmirror.
>
>
>
> But with the latest 8.2, my server will not boot anymore if i label the
> disk with gmirror.
>
>
>
> Gpart status
>
> Name  Status  Components
>
> ad4p1      OK  ad4

>
> Then i do a gmirror label -v -b load gm0 /dev/ad4
>
>
> Edit /etc/fstab
>
> And change /dev/ad4px to /dev/mirror/gm0px
>
>
> I reboot, and it hangs when tring to Mount the root device.
>
> I get an error about an corrupt gpt label.

Yes, GPT has the unfortunate property that it records its data both at 
the beginning of a drive and at the end, so you cannot use it this way 
(because gmirror wants the last sector for itself).

I haven't tried it but I think from the GPT specification that it 
records where the secondary table is, so maybe you could do it the other 
way around: first do a gmirror configuration, then create GPT partitions 
within the gmirror device (i.e. on /dev/mirror/gm0, not on /dev/ad4).