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Date: Thu, 25 Jun 2015 16:34:43 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: wfdudley <wfdudley@gmail.com>
cc: freebsd-questions@freebsd.org
Subject: Re: freebsd-update from 8.4 to 9.3 causes gmirror to disappear --
 HELP!
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On Thu, 25 Jun 2015, wfdudley wrote:

> Update: I reverted to 8.4 RELEASE and my mirror is back.
>
> So, how the heck do I use freebsd-update to get to 9.3 ?  Do I have to
> un-mirror my disks?

Step 1. Make a full backup somewhere else, not on the mirror.
Step 2. Verify the data on that full backup.

Only after steps 1 and 2, see
https://www.freebsd.org/releases/9.0R/relnotes-detailed.html#AEN1277

Then watch for error messages and proceed from there.