Mirroring

When you use disk mirroring, the database server writes each piece of data to two locations. Mirroring is a strategy that pairs a primary chunk of one storage space with an equal-sized mirrored chunk. Every write to the primary chunk is automatically accompanied by an identical write to the mirrored chunk. If a failure occurs on the primary chunk, mirroring lets you read from and write to the mirrored chunk until you can recover the primary chunk, all without interrupting user access to data.

It is recommended that you mirror the following data:

• Root dbspace
• Dbspaces that contain the physical log and logical-log files
• Frequently queried data

For information about mirroring, see the IBM Informix Administrator's Guide.