3.5.1 Matrix Server Administration Guide

Chapter 7: Configure PSFS Filesystems 109

Note for Oracle Real Application Clusters Users

When placing Oracle Clusterware files on DB Optimized mounted

filesystems, the files must be pre-initialized with the dd(1) command.

This is a requirement with any CFS when using Oracle Clusterware. To

presize the Oracle Clusterware files, perform the following action:

$ dd if=/dev/zero of=<mountpoint>/ocr.dbf bs=1024k count=200

$ dd if=/dev/zero of=<mountpoint>/css.dbf bs=1024k count=25

Advanced Mount Options

Click the Advanced button on the Mount Filesystem window to see the

additional options.

The advanced mount options are as follows:

Shared or Exclusive. Either allow all servers having physical access to the

filesystem to mount it or allow only one server. Shared is the default.

Ordered or Unordered. The Ordered option provides additional security

for writes to the filesystem. If a metadata operation will allocate user

blocks, the user blocks are written to the filesystem before the metadata is

written. With the Unordered option, the writes can occur in either order.

The default is Ordered.

Enable Cluster-Coherent Record Locks. Cluster-coherent record locking

is enabled by default. To disable cluster-coherent locking on all nodes in

the matrix, remove the checkmark from the “Enable Cluster-Coherent

Record Locks” option.