If your data is not already decomposed nor is the Reader decompose option available, then EnSight has the final option of using the EnSight server to decompose (also called auto-distribute, since the EnSight server automatically does the distribution). Pre-partitioning is not required. Each server will determine its portion using a connectivity-based partitioning algorithm (selecting N elements in the connectivity order), and will read and act just on that portion.
Note: This connectivity based algorithm is different than the partition utility described above.
Use of SOS with our native, Case Gold format can use an ASCII SOS Casefile which is a map for how data is to be distributed to the Servers using auto-distribute.