The base layer of SAP HANA provides two file I/O interfaces:
- SimpleFile―Used for small, simple I/O requests on configuration files, traces, and so on. This interface uses lightweight, platform-independent wrappers around system calls.
- FileFactory & File―Used for huge, complex streams of I/O requests on the data and log volumes and for backup and recovery. This interface uses synchronous and asynchronous I/O operations.
You can configure the SAP HANA file I/O layer to optimize file I/O for a specific file system and storage array.
Note: The Linux XFS file system is used on all Dell EMC storage volumes for the SAP HANA persistence.