Informix Error -23549: CM error: This would create a chunk that would overlap its own mirror.
Cause and resolution
CM error: This would create a chunk that would overlap its own mirror.
You have issued a command to the CM system that tries to create a chunk that overlaps its mirror chunk. This happens most commonly because of arithmetic mistakes in offset calculation.
Examine your command and re-issue it so that the chunk and its mirror will not overlap.
Oninit® Troubleshooting Guidance
Reasons / Common Causes
-23549 fires when a CM command would create a chunk that overlaps its own mirror chunk — per the official guidance, most commonly from arithmetic mistakes in offset calculation.
- An offset calculation error causing a chunk to overlap its mirror, per the official guidance — the direct, only cause.
Solutions / Resolution
- Examine the command and re-issue it so the chunk and its mirror don't overlap, per the official guidance.
Examples
N/A
No specific triggering statement is documented beyond a chunk/mirror offset overlap.
Diagnostic Checks
- Recheck the offset arithmetic for the chunk and its mirror, and adjust to avoid overlap.
Related Errors / Related Topics
- -23547 — "CM error: This would create two chunks that would overlap each other." The general chunk-overlap error this is a specific case of, for a chunk and its own mirror.
- -23550 — "CM error: This would create a chunk that would overlap an existing chunk." A related overlap error, against an unrelated existing chunk rather than its own mirror.
A chunk-creation command would overlap its own mirror — recheck the offset arithmetic.