In the Exadata X9M-2 configuration:
High Capacity (HC) Storage Server: Each HC storage server is equipped with 4 x 6.4 TB NVMe flash cards. These flash cards serve as a cache layer to accelerate I/O performance, especially for read-heavy and mixed workload environments. This configuration combines large storage capacity with NVMe flash for optimal data processing.
Extreme Flash (EF) Storage Server: Each EF storage server contains 8 x 6.4 TB NVMe flash cards, which provides extremely high IOPS and low latency. This configuration is designed for applications demanding high-performance flash storage, making it suitable for intensive OLTP and analytical workloads.
Database Server Flash Storage: The Exadata X9M-2 database servers themselves do not include flash storage as part of their default configuration, which aligns with option D. However, since option E is correct, we do not include D as the other correct answer.

On Oracle Exadata Database Machine X9M, the default configuration of the IPTables firewall varies between storage servers and database servers:
Storage Servers: After initial deployment, IPTables is installed but remains in an unconfigured and inactive state. The Exadata storage servers focus on providing high availability and performance for database workloads and thus rely on internal security measures. The external firewall or network security policies typically handle firewall responsibilities, so IPTables is not actively configured on these servers by default.
Database Servers: Similar to storage servers, IPTables is also installed but neither configured nor running on the database servers. The Oracle Exadata Database Machine X9M emphasizes security through other means, such as its network isolation and dedicated interconnects. As part of Oracle's engineered systems design philosophy, the database servers are primarily focused on database performance, offloading much of the security management to other parts of the infrastructure and relying on data center-level firewalls for perimeter security.
To summarize, both database and storage servers have IPTables installed and available, but they are not configured or running by default on either server type. This setup allows Exadata environments to focus on optimized database performance while integrating with external network security solutions.

According to the Oracle documentation1, two monitoring tools that might be useful in examining I/O performance for the prod database are:
cellcli (or exacli/exadcli) to examine storage server metrics such as database, category, ceiidisk, and griddisk (D). This tool can help you monitor the I/O Resource Management (IORM) metrics and identify any bottlenecks or imbalances in the storage layer.
I/O-specific dynamic performance views such as v$iostat_fiie, v$iostat_function, and v$iostat_consumer_group from the prod database instances using SQL *plus. These views can help you monitor the I/O activity and latency at the file, function, and consumer group level.

The "cell PMEM cache Read Hits" in the "Database IOs" portion of the "Performance Summary" will show the number of reads that have been satisfied from the Persistent Memory Cache. The "PMEM Cache" section within "Memory Statistics" will give detailed information about the usage of the Persistent Memory Cache, such as cache size, used size, hit rate, etc. This information can help to identify if the Persistent Memory Cache is being used effectively and if there are any issues with it.

The correct sequence is:
Review the safety guidelines. This is important to ensure a safe and successful installation1.
Unpack Oracle Exadata Rack. This involves removing the packaging materials and inspecting the rack for damage or missing components1.
Place Exadata in its allocated space. This involves moving the rack to its final location and securing it with bolts and brackets1.
Let the Exadata acclimatize for 24 hours. This is recommended to allow the rack components to adjust to the ambient temperature and humidity before powering on1.
Stabilize the Exadata Rack. This involves leveling the rack and adjusting its height if needed1.
Power on Exadata PDU B. This involves connecting PDU B to a power source and turning it on1.
Power on Exadata PDU A. This involves connecting PDU A to a power source and turning it on1