Quite some time has passed since we talked about the problem between the StorCenter ix2-200 and Mac OS X Lion and in the meantime something has moved and Iomega finally released a firmware update that should solve compatibility problems.
The update can be downaloaded from this page https://iomega-eu-en.custhelp.com/app/answers/detail/a_id/22318
I have mirrored the file here.