This procedure is the first step in the recovery of a lost mirrored chunk with an Informix database.

1. Use the message log file to identify a lost mirrored chunk. A message indicating that an error occurred in a mirrored chunk might look like this:

15:22:26 Assert Failed: WARNING! I/O error, Mirror

Chunk '/.../sapdata3'

15:22:26 Who: Session(22, informixSession(22, info

sap10, 26981, 12) Thread(54, sqlexec,

80f20be0, 1)

15:22:26 Results: Chunk is now unusable

15:22:26 Action: Repair and restore from mirror or

archive

15:22:26 /tmp/af.3fea

15:22:29 Checkpoint Completed: duration was 2 seconds

2. Use onstat -d to display the status of a dbspace. A down chunk has the status D (for "down") in the second position of the field flags . For example:

Now that you have identified the lost mirrored chunk, you can go on to Creating a New Link for a Lost Mirrored Chunk.