Oracle Tips by Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

PSFS File System

It is a standard Linux File system that supports file system operations such as mkfs, mount and unmount and byte-range locking with complete cache coherency.

PolyServe MxS uses a registry to control server access to the PSFS file system on the SAN disks imported into the matrix. It supports journaling and online crash recovery.

PSFS supports context dependent symbolic links (CDSL). CDSL are used to manage node-specific files and directories. CDSL(s) enable database administrators to easily create an Oracle Home directory that can be shared by all nodes in the matrix.

CDSL contains a keyword that identifies a particular location. When the operating system resolves the symbolic link, it translates the keyword into the appropriate pathname. For example, a CDSL could contain the keyword HOSTNAME, which resolves the hostname of the server where it has been logged in.