New Mac (running Yosemite)? DON’T enable FileVault during set-up..

.. otherwise you’ll end up having to boot into recovery mode, delete Core Storage volumes, format the SSD, re-install OS X, restore everything from Time Machine backup (see my article on clearing away Core Storage volumes – originally written in 2011).

There appears to be a bug:

that affects anybody enabling FileVault during the initial set-up of OS X whether it be an upgrade from OS X Mavericks, a brand new machine, or a re-install of OS X.

Enabling FileVault during the set-up process can seemingly lead to the disk never finishing the initial encryption phase.  It’ll be stuck in “paused” mode forever more.  Some have said that leaving the machine online for 24 hours will fix it.  Some have attempted PRAM, SMC and disk repairs.

But there is only one way to get things moving along: nuking the current OS X Yosemite installation, re-install OS X again, but DON’T enable FileVault during the initial set-up screens.  Instead wait to get to the desktop, open System Preferences -> Security & Privacy -> FileVault and enable it there.