Because Oracle redo log files managed by ASM use multiple disks within a disk group, a simple path cannot be specified for a log device. The following Mirror Replication Agent commands accommodate this ASM functionality.
pdb_asmdiskmap – This command is available only for Oracle and creates a file with default disk mirror paths for all disks in the ASM disk groups that are used to store online redo logs and archive redo logs. The disks required for online logs are automatically selected by querying ASM.
ra_helpdevice – This command returns one row output for each disk in the group where the device is stored. For the device ID, the command returns the value of the Oracle log device group ID. The disk mirror path returned is the path obtained from the ASM disk map file.
ra_updatedevices – When you change a disk group by adding or dropping disks, you must also invoke use this command to be sure the log device repository is updated with correct ASM storage information.
For a full description of these commands and their usage, see the Mirror Replication Agent Reference Manual.
