DSNB741I `csect-name` DUPLEXING COULD NOT BE ESTABLISHED FOR GROUP BUFFER POOL `gbpname` REASON = `reason`

Explanation
 Db2 was
unable to establish duplexing for the named group buffer pool. reason indicates
the Db2 reason code indicating
why duplexing could not be established.

System action
 The group buffer pool goes back to simplex mode.

System programmer response
 See the explanation for the reason
code given.