Oracle Cluster File System 2; Reiserfs - Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

This ensures that the Ext3 file system is recognized as such. The change takes effect after the
next reboot.
3 To boot a root file system that is set up as an Ext3 partition, include the modules
in the
3a Edit
variable, then save the changes.
3b Run the
This builds a new initrd and prepares it for use.
4 Reboot the system.

1.2.3 Oracle Cluster File System 2

OCFS2 is a journaling file system that has been tailor-made for clustering setups. In contrast to a
standard single-node file system like Ext3, OCFS2 is capable of managing several nodes. OCFS2
allows you to spread a file system across shared storage, such as a SAN or multipath setup.
Every node in an OCFS2 setup has concurrent read and write access to all data. This requires
OCFS2 to be cluster-aware, meaning that OCFS2 must include a means to determine which nodes
are in the cluster and whether these nodes are actually alive and available. To compute a cluster's
membership, OCFS2 includes a node manager. To monitor the availability of the nodes in a cluster,
OCFS2 includes a simple heartbeat implementation. To avoid problems arising from various nodes
directly accessing the file system, OCFS2 also contains a distributed lock manager. Communication
between the nodes is handled via a TCP-based messaging system.
Major features and benefits of OCFS2 include:
Metadata caching and journaling
Asynchronous and direct I/O support for database files for improved database performance
Support for multiple block sizes (where each volume can have a different block size) up to 4
KB, for a maximum volume size of 16 TB
Cross-node file data consistency
Support for up to 255 cluster nodes
For more in-depth information about OCFS2, refer to the High Availability Storage Infrastructure
Administration Guide.

1.2.4 ReiserFS

Officially one of the key features of the 2.4 kernel release, ReiserFS has been available as a kernel
patch for 2.2.x SUSE kernels since version 6.4. ReiserFS was designed by Hans Reiser and the
Namesys development team. It has proven itself to be a powerful alternative to Ext2. Its key assets
are better disk space utilization, better disk access performance, faster crash recovery, and reliability
through data journaling.
"Better Disk Space Utilization" on page 17
"Better Disk Access Performance" on page 17
"Fast Crash Recovery" on page 17
"Reliability through Data Journaling" on page 17
16 SLES 11: Storage Administration Guide
.
initrd
/etc/sysconfig/kernel
command.
mkinitrd
as , adding and
root ext3
and
ext3
to the
jbd INITRD_MODULES
jbd