But it still possible for other processes to write to these devices, using “dd” for instance. It stamps the devices so that it can identify them, provides an unique and consistent name for ASM and sets propper permissions for the devices. And you must set permissions and ownership for these devices. You need to configure multipathing and make sure that the device name that will be used for ASM is always the same. If you are running Oracle RAC, then configuring the shared storage is one of the main preinstallation tasks that needs to be done.
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