I have been using a 1 TB SSD with my 17" MacBook Pro Early 2011. With the recent availability of 2 TB SSD's, I wanted to upgrade to the larger size. I have upgraded my HD several times since I purchased this MacBook four years ago, including two years ago when I installed the 1 TB SSD (as well as having upgraded a previous Early 2009 model).
Each time, I used SuperDuper! to transfer the partition to the new HD (connected via USB), and then put the new HD into the MacBook Pro. I then turned on FileVault, and the new HD partition was encrypted.
However, this time was different -- when I tried to turn on FileVault, I got the message that I can't enable FileVault because the recovery partition is missing. Using
diskutil list, but not Disk Utility, I can see a recovery partition on the old HD. Of course, I believe my MacBook came with the operating system (which I think was Lion) on DVD's, before the operating system was being shipped on the recovery partition. I had previously upgraded the old 1 TB SSD to Yosemite.
There are a few mentions of this problem online, including Can't Enable Filevault because Recovery Partition Missing from 2011, suggesting reinstalling Lion. http://www.techrepublic.com/article/pro-tip-restore-the-recovery-partition-in-os-x-10-10-yosemite/ suggested reinstalling the operating system, but also suggested that that might result in system instability in the future, and therefore suggested using Carbon Copy Cloner 4. https://www.linkedin.com/pulse/how-re-create-missing-recovery-partition-os-x-mattia provides instructions about creating a new recovery partition, but doesn't specifically mention the problem with FileVault, or whether following that process would allow FileVault to start.