How you list a multi-instance broker.
mqsilist
BIP1284I: Broker 'BK1' on queue manager 'QM1' is running.
BIP1292I: The multi-instance Broker 'BKHA1' on multi-instance queue manager
'QMHA1' has stopped.
BIP1294I Broker 'BKHA2' is a multi-instance broker running in standby mode
on multi-instance queue manager 'QMHA2'.
BIP1295I Broker 'BKHA3' is a multi-instance broker running in active mode on
multi-instance queue manager 'QMHA3'
BIP8071I: Successful command completion.