On Sun, 2 Jun 2013, Warren Block wrote:

[snip]

> gmirror is good.  GPT is also good.  The combination is a problem. gmirror
> metadata overwrites the backup GPT, so those disks will show "corrupt" also.
> For now, the recommended workaround is to just use MBR, which doesn't have any
> metadata at the end of the disk.

... or gmirror not whole disks, but GPT partitions (as OP does, as far as I can 
tell from gmirror dmesg reports)

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 [email protected] ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- [email protected] ***
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