Home > Veritas Storage Foundation™ Cluster File System Manual Pages

MOUNT_ODM (1)
User Commands

Table of contents

NAME

mount_odm - mount the ODM file system

SYNOPSIS

mount -F odm [-o specific_options ] /dev/odm /dev/odm

umount /dev/odm

AVAILABILITY

VRTSodm

DESCRIPTION

The mount_odm command mounts the ODM file system and makes the Veritas Extension for Oracle Disk Manager available for use by Oracle. The primary function of the mount_odm command is to mount the dummy ODM device /dev/odm/ on the /dev/odm/ directory. The mount_odm command differs from other file systems mount commands, such as mount(1M) or mount_vxfs(1M), which mount devices containing actual data at the specified directory.

The ODM file system contains only pseudo-files that are used for administrative purposes, much like the files in /proc. All data files used by Oracle go into a Veritas File System (VxFS) file system or a Veritas Volume Manager (VxVM) raw volume. Either VxFS or VxVM must be present on the system for Veritas ODM to work.

NOTES

/dev/odm contains no data and does not need to be backed up.

Multiple -o options can be specified only in a comma-separated list.

Only a privileged user can mount file systems.

Cluster ODM Issues

Veritas Group Messaging Service (VRTSgms) product must be installed on the system for enabling Veritas ODM's cluster functionality.

OPTIONS

-F odm
Specifies the ODM file system type.
-o
Specifies the ODM-specific options in a comma-separated list. The available options are:
cluster
Forcibly enables ODM cluster functionality. The cluster option requires that the VRTSgms cluster product be available on the system. If this option is enabled and no cluster is available, ODM issues a 'cluster disabled' warning statement and brings up the system in local mount mode. If neither the cluster or nocluster option is specified and VRTSgms is available, ODM automatically enables cluster functionality. If neither the cluster or nocluster option is specified and clustering is not available, local mount operation is automatically enabled.
nocluster
Disables clustered ODM functionality, even if the system is configured to allow clustered ODM. This option ensures that ODM is made available without the cluster functionality.

smartsync
Enables ODM support for Oracle's mirror resilvering feature, also known as smartsync. This is the default. When mounted with the smartsync option, ODM allows certain types of Oracle files that reside on mirrored VxVM volumes to be resynced by Oracle during a system crash. The smartsync option eliminates the need for VxVM to track out-of-sync disk blocks on mirrors and consequently improves overall performance.

nosmartsync
Disables ODM support for Oracle's mirror resilvering feature. This is similar to ODM's default behavior in pre-5.0 releases. This option places the sole responsibility of resyncing all mirrors of a volume on VxVM after a system crash.

wait
Waits for the ODM cluster functionality to become enabled. By default, the mount_odm command returns immediately and the job of enabling ODM's cluster functionality is done by a separate thread in the background.

EXAMPLES

Mount the ODM file system: 

# mount -F odm /dev/odm /dev/odm

Mount the ODM file system without the cluster and smartsync functionality: 

# mount -F odm -o nocluster,nosmartsync /dev/odm /dev/odm

FILES

/etc/mnttab
Table of mounted file systems

SEE ALSO

Veritas Storage Foundation for Oracle Administrator's Guide
Veritas Storage Foundation for Oracle RAC Administrator's Guide
Veritas Storage Foundation for Oracle RAC Release Notes

Last updated: 1 Jun 2006
Copyright ©2009 Symantec Corporation
All rights reserved.