When configuring Oracle Exadata Database Machine, you can choose High Capacity (HC) or Extreme Flash (EF) storage servers. HC storage servers contain high-performance flash memory and hard disk drives (HDDs). EF storage servers have an all-flash configuration.
Exadata X11M HC and EF storage server models are also equipped with additional memory (DDR5 DRAM) for Exadata RDMA Memory Cache (XRMEM cache), which supports high-performance data access using Remote Direct Memory Access (RDMA).
Note: All specifications are for Exadata X11M storage servers. See the related resources for more details about Exadata X11M and information about prior models.