3.1.2 Matrix Server Administration Guide

Chapter 7: Configure PSFS Filesystems 99

quorum disk, the Oracle GCS and SPFILE, and so on) and for tools (for

example, backup tools) that manipulate database objects. Database

operational functions such as compressing a tablespace that is being

transported, copying datafiles, and so forth are also supported.

With the DB Optimized mount option, there is no operating system read-

ahead. Tools that perform small I/O requests will execute dramatically

slower on DB Optimized mounted filesystems than on regular mounts.

Tools such as cp(1) and gzip(1), which are used in ancillary database

operations such as relocating archived transaction logs, will suffer. When

possible, use dd(1) with large block-size operations to move files between

DB Optimized mounts and other DB Optimized mounts or regular

mounts. If this is not an acceptable solution, contact PolyServe Technical

Support, as there are several options to address this issue.

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.