SAS sessions started by SAS users tend to perform large sequential reads and writes. Some of the new SAS BI applications do some random access of data, but for the most part the SAS workload can be characterized as predominately large sequential IO requests with high volumes of data. One thing to note is if there are multiple concurrent SAS sessions accessing the same data file, (each SAS session is accessing the file in a sequential fashion), and the heavy volume of access requests can appear to be random in nature to the storage subsystem. Storage Administrators should be made aware of this phenomenon as they monitor the system.