FortiAnalyzer allows you to export reports to a variety of formats, including CSV (comma-separated values) format, which is useful for situations that require further analysis of data in spreadsheet software.

Log Data Sync provides real-time log synchronization to all backup devices. - Log Data Sync in FortiAnalyzer HA setups is designed to ensure that all backup devices in the cluster are kept up-to-date with real-time log data from the primary device. This synchronization helps maintain log integrity and availability even in the event of a primary device failure.
With Initial Logs Sync, when you add a unit to an HA cluster, the primary device synchronizes its logs with the backup device. - When a new unit is added to an HA cluster, Initial Logs Sync is crucial to ensure that the new unit starts with a complete set of logs. This process involves the primary device synchronizing its existing logs to the newly added backup unit, which ensures consistency across the cluster.

Disk size - This is a fundamental parameter. The total disk size directly impacts how much space is available for storing logs, reports, and other data. A larger disk size means more space is available, which can influence the reserved space portion proportionally.
RAID level - The RAID (Redundant Array of Independent Disks) configuration used affects how disk space is utilized. Different RAID levels offer varying balances of performance, data availability, and storage capacity. For example, RAID 1 mirrors the entire contents of the disk, effectively halving the storage capacity for data protection, while RAID 5 uses striping with parity and offers better space efficiency but requires space for parity information.

On FortiAnalyzer, analytics logs refer to the logs that have been processed, indexed, and then stored in the SQL database. This process allows for efficient data retrieval and analytics. Unlike basic log storage, which might involve simple compression and storage in a file system, analytics logs in FortiAnalyzer undergo an indexing process. This enables advanced features such as quick search, report generation, and detailed analysis, making it easier for administrators to gain insights into network activities and security incidents.
Reference: FortiAnalyzer 7.2 Administrator Guide - "Log Management" and "Data Analytics" sections.

The process logfiled in FortiGate units with an SSD disk is responsible for buffering logs when FortiAnalyzer is unreachable. If the connection to FortiAnalyzer is lost and the memory log buffer is full, logfiled allows logs to be buffered on disk. These logs are then sent to FortiAnalyzer once the connection is restored. This reliable logging mechanism ensures that logs are not lost during periods when FortiAnalyzer is not reachable, thereby maintaining log integrity and continuity.
Reference: FortiOS 7.4.1 Administration Guide, "Log Buffering" and "Reliable Logging" sections.