Enabling TDE without breaking existing mirror I've been trying to enable TDE in a mirrored SQL Server 2008 R2 configuration. Enabling TDE is not so difficult, though when I enable TDE on the principal, the mirror database goes in to a suspended state.

There are a few good articles here and here as well as many others, but they all demonstrate enabling TDE on a mirrored configuration with importing the database in the mirror before enabling encryption. I've not yet found a way to simply turn on TDE in an existing mirrored system.

I've gone so far as to export the service master key and service keys from the Principal and import them in the mirror. I've tried transact-sql'ing mirroring in the hopes that what I was seeing in the GUI was erroneous due to some advanced mirroring things going on, with no success.

Is enabling TDE across an existing mirrored SQL Server setup possible?
From the looks of this article, you would probably have to break the mirror first, setup TDE, and then setup the mirror again. Not ideal, but it would work.