IORM Architecture in Exadata

From the database notes, the I/O requests are sent to the cell nodes. These requests go through the intelligent iDB protocol containing information pieces like database name, category name, consumer group etc. These I/O requests are placed in the CELLsrv I/O queues in the order they are received. Then these I/O requests are passed to the IORM, which prioritize these requests on the basis of IORM plan and then places them accordingly into the Cell disk queues.