gmirror failed with error 19.

[Vick Khera]

A couple of weeks ago I discovered this <http://lists.freebsd.org/pipermail/freebsd-geom/2011-October/005071.html> which seemed to identically match a problem I was having with one server upgrading to 9.0.

However, another system I have survived an upgrad through this change just fine with zero errors.  It also exhibited the same change in part output.

The relevant bits of change are:

-last: 156249953
+last: 156249998

where the latter number is from the 9.0 boot of this system.

So, it seems that something other than just the "last" reported from gpart is causing gmirror to fail its integrity check.