Enable Asynchronous Disk I/O

Enable asynchronous disk I/O on Linux, IBM, and HP-UX.

SAP recommends that you do not use block devices as database devices on UNIX and Linux systems; a system failure may lead to loss of data integrity if you do so.

If you are using raw devices on a UNIX platform, you cannot:
If either of these are set to true, SAP ASE returns a message similar to:
You cannot set directio option for raw device '/dev/raw/raw235' or You cannot set attribute dsync for raw device