Apple is running servers from IBM and Oracle with flavors of the Unix operating system at its Maiden, North Carolina, data center, according to a job entry posted on the company's website.

"Data center environment consists of Mac OS X, IBM/AIX and Sun/Solaris systems," says the job entry, which is posted for Maiden. Apple has invested US$500 million into the Maiden data center, which opened last year and is one of the backbones for Apple's iCloud online service.

Little is known about the hardware used in the data center, which is mostly known for its use of renewable energy. The company wants to run the Maiden facility on a higher percentage of renewable energy, sourced from the U.S.' "largest end user-owned solar array" and the "largest non-utility fuel cell installation" in the U.S.

Agam Shah covers PCs, tablets, servers, chips and semiconductors for IDG News Service. Follow Agam on Twitter at @agamsh. Agam's e-mail address is [email protected]