[GTALUG] Luks on Ubuntu 14.04

Hey everyone, I've been trying to resolve an issue unlocking a luks encrypted partition on boot using Ubuntu 14.04. I've set it up to automatically unlock after the root partition's password has been entered by adding the target entry into /etc/initramfs-tools/conf.d/cryptroot. I have 6 drives in this machine and 5 unlock fine. The 6th errors out with unkonwn fs or bad options or password. I can unlock the partition after boot using the derived key from cryptroot. I've tried to zero out the drive and start over but the problem persists. Can anyone give me any pointers on how to solve this? The drive is used as a cache drive for the zfs file system. Thanks! Randy