In
distributed computing, a
single system image (
SSI) cluster is a
cluster of machines that appears to be one single system. The concept is often considered synonymous with that of a
distributed operating system, but a single image may be presented for more limited purposes, just
job scheduling for instance, which may be achieved by means of an additional layer of software over conventional
operating system images running on each
node. The interest in SSI clusters is based on the perception that they may be simpler to use and administer than more specialized clusters.