A partition on my 2nd OWC Elite Qx2 disappeared off my desktop and then failed to mount. Not sure why this happened but it had me worried for about 15 minutes. These following links helped me resolve the issue:
While I was in Disk Utility I also took the time to verify all of my drives/partitions and repair some permissions just to stave off future catastrophic failures. Toying with the idea of a single 8-bay RAID to combine the media servers and then repurpose them for other duties. Needless to say I'm outgrowing my infrastructure... again!