On May 28, 2012, at 9:21 PM, Stephan Budach wrote:

> Hi all,
> just to wrap this issue up: as FMA didn't report any other error than the one 
> which led to the degradation of the one mirror, I detached the original drive 
> from the zpool which flagged the mirror vdev as ONLINE (although there was 
> still a cksum error count of 23 on the spare drive).

You showed the result of the FMA diagnosis, but not the error reports.
One feature of the error reports on modern Solaris is that the expected and 
bit images are described, showing the nature and extent of the corruption.

> Afterwards I attached the formerly degraded drive again to the good drive in 
> that mirror and let the resilver finish, which didn't show any errors at all. 
> Finally I detached the former spare drive and re-added it as a spare drive 
> again.

Good. Perhaps they were transient.

> Now, I will run a scrub once more to veryfy the zpool.

Good idea.
 -- richard

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