SAP Note 22557 - oncheck -cr returns bogus errors on primary chunks

Symptom:

oncheck -cr utility returns bogus error message 'I/O Error, Primary Chunk xxxxxx Offline; I/O lseek() ...... -> errno = 9 '. However, the server does not return any 'chunk down' errors and onstat -d returns PO for the chunk.

Cause and prerequisites

This is caused by improper permissions set on a logical chunk. The utility then cannot access the chunk in order to update system tables.

Solution
Please verify that the permissions are set to '660 informix informix' on the chunk.