I found this document helpful, hence sharing with you.
Click the link to see the document → SAP Sybase ASE 15.7 Raw Device Setup Centos Linux Worked Example
Discussion on SAP Community Network on Sybase ASE Raw Devices
Here is a link to a discussion on the SAP Community Network:-
Click the link to see the discussion → http://scn.sap.com/thread/3569074
SAP Document on Raw Devices
This document published in 2013 seems to imply that raw filesystems are supported by SAP. For SAP applications file system devices are preferred due to the set up required.
Click the link to see the document → SAP pdf document on raw devices
Disclaimer : This document is just redirect you on some content which is prepared by Alastair Cook (firstname.lastname@example.org ), not by me, it is shared with you for the knowledge base. It might help you.