Can't mount (CoreStorage) encrypted volume anymore

Hi,
I use the following setup:
SSD: System
Internal HDD: Data (Documents, Music, etc.)
Both disks are encrypted via the Core Storage utility.
It seems I can't mount the "Data" disk anymore.
I wanted to download a random pdf which failed. ("Downloads Folder" is on "Data" Volume) Restarted the machine and now all aliased folders which refer to the "Data" volume have a question mark overlay rendered on their icon.
It's not possible to mount/unlock the "Data" disk through disk utility a. The "Data" volume is, according to DiskUtility quite full (only 16MB left). I have the suspicion that this small amount of space left in combination with the encryption causes some trouble.
What to do?
+-- Logical Volume Group 5898542B-F53F-46A6-B529-C31152081292
=========================================================
Name: Data
Status: Online
Size: 499763888128 B (499.8 GB)
Free Space: 16777216 B (16.8 MB)
|
+-< Physical Volume C6AAFA40-7F30-40C3-BC1E-A71A3C3DA757
| ----------------------------------------------------
| Index: 0
| Disk: disk2s2
| Status: Online
| Size: 499763888128 B (499.8 GB)
|
+-> Logical Volume Family 77CFA80C-6CEA-4FA5-8855-567C90FD2513
Encryption Status: Unlocked
Encryption Type: AES-XTS
Conversion Status: Complete
Conversion Direction: -none-
Has Encrypted Extents: Yes
Fully Secure: Yes
Passphrase Required: Yes
|
+-> Logical Volume E2DB4126-C04C-4AE1-B1AC-CDFF0218D537
Disk: disk3
Status: Online
Size (Total): 499428339712 B (499.4 GB)
Conversion Progress: -none-
Revertible: Yes (unlock and decryption required)
LV Name: Data
Volume Name: Data
Content Hint: Apple_HFS

Your unsupported hardware configuration may be causing the problem. The optical bay wasn't designed to take either an SSD or an HD.

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