If you enable mirroring when you initialize the database server, you can also specify a mirror pathname and offset for the root chunk. The database server creates the mirror chunk when the server is initialized. However, because the root chunk contains logical-log files, mirroring does not actually start until you perform a level-0 backup.
To specify the root mirror pathname and offset, set the values of MIRRORPATH and MIRROROFFSET in the ONCONFIG file before you bring up the database server.
If you do not provide a mirror pathname and offset, but you do want to start mirroring the root dbspace, you must change the mirroring status of the root dbspace once the database server is initialized.
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