On February 17, 2015 IBM rebranded GPFS as IBM Spectrum Scale. The General Parallel File System (GPFS) is a high-performance clustered file system developed by IBM. It can be deployed in shared-disk or shared-nothing distributed parallel modes. It is used by many of the world's largest commercial companies, as well as some of the supercomputers on the Top 500 List. For example, GPFS was the filesystem of the ASC Purple Supercomputer which was composed of more than 12,000 processors and has 2 petabytes of total disk storage spanning more than 11,000 disks.