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 Spectrum Scale. SoFS exports the clustered file system through industry standard protocols like SMB, NFS, FTP and HTTP. Released in 2007, SoFS is a second generation file services architecture used within IBM since 2001. SoFS combines proprietary IBM technology (block storage and compute servers and Spectrum Scale) with open source components including Linux, Samba, and CTDB.