Mirroring starts when you create a mirror chunk for each primary chunk in a dbspace.
This action consists of specifying disk space that you have already allocated, either raw disk space or a cooked file, for each mirror chunk.
When you create a mirror chunk, the database server performs the recovery process, copying data from the primary chunk to the mirror chunk. When this process is complete, the database server begins mirroring data. If the primary chunk contains logical-log files, the database server does not perform the recovery process immediately after you create the mirror chunk but waits until you perform a level-0 backup. For an explanation of this behavior see Creation of a Mirror Chunk.
You must always start mirroring for an entire dbspace. The database server does not permit you to select particular chunks in a dbspace to mirror.
When you select a space to mirror, you must create mirror chunks for every chunk within the space.
You start mirroring a storage space when you perform the following operations:
Each of these operations requires you to create mirror chunks for the existing chunks in the storage space.
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