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 LUNs for the SAP HANA persistence.
After the SAP HANA persistence is installed on Unity LUNs, set the following file I/O layer parameters for optimal I/O processing after the initial SAP HANA installation has been completed: