Scale out File Services (SoFS) is a highly scalable, grid-based NAS implementation developed by IBM. It is based on IBM's high-performance shared-disk clustered file system GPFS. SoFS exports the clustered file system through industry standard protocols like CIFS, NFS, FTP and HTTP. Released in 2007, SoFS is a second generation file services architecture used within IBM since 2001.
All of the SoFS nodes in the grid export all files of all file systems simultaneously. This is a different approach from some other clustered NAS implementations which pin individual files to a single node or pair of nodes thus limiting the single file performance dramatically. Each file system can be multiple petabytes in size.
Since February 2010, IBM is offering a hardened appliance version (better: evolution) of SoFS, called Scale Out Network Attached Storage (SONAS). SONAS includes a subset of the described software stack plus a new management layer. Major differences are a strict hardware support matrix, integrated high-density disk storage, and a delivery model with a standard IBM product warranty. Technically, SONAS uses an internal Infiniband network to get low latency and high cluster throughput. The cluster architecture is derived from leading Top500 supercomputer designs.
- IBM Corp. (2007-10-07). "IBM Storage Optimization and Integration Services—scale out file services". Data sheet (GTD01407-USEN-01) retrieved on 2008-01-07.
- IBM Corp. (2008-01-18). "Kantana Selects IBM Scale-Out File Services to Boost Its Data Storage System for Animation Production". Press release retrieved on 2008-01-23
- IBM Corp. (2008-06-18). "IBM Scale out File Services: Reinventing network-attached storage"
- IBM video (2011-01-11) SONAS and Why Smart Businesses are Turning to Cloud Storage
- IBM video (2008) customer reference video featuring SoFS at Kantana Animations