Each mirror chunk must be
the same size as its primary chunk. When a mirror chunk is created,
the database server writes the contents of the primary chunk to the
mirror chunk immediately.
The mirror chunk contains the same control structures as the primary
chunk. Mirrors of blobspace, sbspace, or dbspace chunks contain the
same physical contents as their primary counterpart after the database
server brings them online.
Mirror-Chunk
Structure illustrates
the mirror-chunk structure as it appears after the chunk is created.
Figure 1: Mirror-Chunk
Structure
The mirror-chunk structure always shows no free space because all
of its space is reserved for mirroring. For more information, see
the chapter on what is mirroring in the Informix® Administrator's
Guide.
