Configuring Default Ownership for Shared Disk Devices

By default, for the 2.6 Linux kernel, the device file naming scheme udev dynamically creates device file names when the server is started, and assigns ownership of them to root. If udev applies default settings, then it changes device file names and owners for disk partitions, possibly corrupting them when the server is restarted. For example, an ASM disk group file on a device named /dev/sdd owned by the user oracle may be on a device named /dev/sdf owned by root after restarting the server. To prevent corruption, you must create either a permissions files or a custom rules file.

Follow the instructions in one of the following sections, depending on your operating system version:

• Using a Permissions File with Oracle Enterprise Linux 4.0 for Red Hat 4 or Oracle Enterprise Linux 4 systems

• Using a Rules File with Oracle Enterprise Linux 5.0 for Red Hat 5 or Oracle Enterprise Linux 5 systems