Yes, there can be only 1U. 
Uptime is essential for today’s business. Without it, your company is losing money, morale and motivation.  Keep your business “always-on” with 1U colocation, 2U+ colocation, disaster recovery and business continuity solutions from Vital Hosting.  Our single server (1U colocation) at-a-time plans will give your company access to our secure data center at an affordable price.  

Tier III - SAS70 TYPE II Compliant
The Vital Hosting data center is a Tier III facility that was originally built for the University of Minnesota to house super computers. Located in the heart of downtown Minneapolis, our facility is strategically positioned at the fiber nexus for the entire region. It features 24x7 security, redundant fault tolerant battery backup, cooling and fire suppression systems, connection to multiple power substations, and on-site generators with over a week of run time.

What does it mean to be a Datacenter?

A Tier 3 datacenter is built to be “concurrently maintainable.” In English, this means that all of the components of the facility are redundant to the extent that any major system – e.g. cooling – can be taken out of service for maintenance or unexpectedly without causing a disruption in service. Our Tier 3 datacenter offers: 99.98% Uptime Multiple internet service providers Multiple power grid connections Concurrently maintainable N+1 battery backup, cooling, generator and fire suppression systems Raised floor Biometric physical security

Affordable 1U At-A-Time Pricing
A rack unit or "U" is a unit of measure used to describe the height of equipment intended for mounting in a 19-inch rack or a 23-inch rack. Most datacenters will only accept minimum agreements of quarter or half rack fulfillment. Network Medics' VitalHosting offers pricing by the single server (1U) in order for small and mid-sized business the ability to quickly and affordably co-locate and have the means for a disaster recovery plan.