To my knowledge, they don't have any storage systems that are 1U. They do have a 4x3.5" hot swap 813M case that could be used to do that, but, lacks a motherboard. www.supermicro.com/products/chassis/1U/?chs=813M
lists their available storage units which has their smallest being a 2U. Nothing I've seen that is 'linkable' falls into their 1U form factor unless someone is using 1U chassis with FC to build their own - in which case I would really suggest just getting a larger case and putting additional drives in it as needed.
As for Supermicro in general, we've used them since 1999 almost exclusively and while we were hit by the capacitor problems in 2001, they stood behind their products and extended the warranty on our gear an additional 3 years. They have a very large installed base and we've not had any problems with compatibility for Linux or Windows and their build quality is very good. If you have a product number, you might post that. We've used everything from their 1U to blades to their twin systems and have a few of the 3U and 4U 'storage' cases.