HP Smart Array 5i Interim Recovery

Yes, it can be done (depending on the controller). You may need the "HP Smart Array Advanced Pack" ($$).

HP calls RAID1->0 "mirror splitting."

Smart Array Advanced Pack is hosted on the Smart Array Controller hardware and can be enabled on the HP Smart Array P212, P410, P410i, and P411 controllers with a Battery Backed Write Cache module or a Flash Backed Write Cache module.. SAAP functionality is standard on the HP Smart Array P812 controller.

http://h18004.www1.hp.com/products/quickspecs/13200_na/13200_na.html

The E200 is an entry-level controller. There are some limitations in its base configuration, so you should be mindful of those.

The quickspecs for the controller are listed here: http://h18000.www1.hp.com/products/quickspecs/12460_na/12460_na.html

Does your unit have a Battery-Backed Write Cache (BBWC) module? That is an necessary component if you wish to use some of the expanded features. Also, how large are the disks you're trying to work with? There is a 2TB limit on individual logical drives...

And finally, firmware level is key here. Here's a link to the drivers and firmware updates for that controller model. Often times, the firmware updates include new or improved functionality. It's worth a try.