In which scenario will griddisks residing on the same celldisk have balanced performance characteristics in an X5 High Capacity Exadata Storage Server? 

Answer options:

A. griddisks on memory based celldisks
B. griddisks on hard disk-based celldisk consumed by ASM when creating diskgroups using ASM-based Intelligent Data Placement (IDP)
C. griddisks on hard disk-based celldisks consumed by the Database Smart Flash Cache
D. griddisks on Flash-based celldisks

B

Intelligent Data Placement enables you to specify disk regions on Oracle ASM disks for best performance. Using the disk region settings, you can ensure that frequently accessed data is placed on the outermost (hot) tracks which have greater speed and higher bandwidth. In addition, files with similar access patterns are located physically close, reducing latency. Intelligent Data Placement also enables the placement of primary and mirror extents into different hot or cold regions. References: https://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#OSTMG10072