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Subject: Re: gmirror component disappears
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Ferruccio Zamuner wrote:

> Oct  9 14:53:28 k7 kernel: GEOM_MIRROR: Synchronization request failed
> (error=1). ad6s1a[WRITE(offset=0, length=131072)]

AFAIK this very much looks like a stale bsdlabel on the device. Try to
destroy (overwrite) first 100kB or so of the device(s) in question with
zeros or random data.