Received an IWNR2731E error when starting a Global Mirror or Metro Global Mirror session
This condition occurs when you exceed the maximum allowable number of Global Mirror or Metro Global Mirror Master sessions.
Problem
You received the following error when attempting to start a Global Mirror or Metro Global Mirror
session:
IWNR2731E Start failed because all source boxes already have
the maximum number of Masters defined on them.You can create multiple sessions and leave them in a defined state in Copy Services Manager for an indefinite length of time. Defined sessions use the same hardware resources, but a session does not use resources until it is started. Attempting to start a session that exceeds the maximum allowable number of Master sessions causes this error to occur. For example, the maximum number of Master sessions for IBM® Enterprise Storage Server® 800 is one. With IBM DS8000® R5.1, you can have 1 - 32 Master sessions.