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From: Kip Macy <kmacy@freebsd.org>
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Subject: Re: ZFS panic under extreme circumstances (2/3 disks corrupted)
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>
> I'm guessing this is the case in OpenSolaris as well...? In any case, it's
> BAD. Unless you keep checking zpool status over and over, you could have a
> disk "failing silently" - which defeats one of the major purposes of ZFS!
> Sure, auto-healing is nice, but it should tell you that it's happening, so
> that you can prepare to replace a disk (i.e. order a new one BEFORE it
> crasches bigtime).
>
>

No, the FMA will persistently track issues like this.

http://opensolaris.org/os/community/fm/
-Kip