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.
You can also add Extended (XT) storage servers for cost-effective storage of less frequently accessed data that must be kept online.
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.