z/VM: CP Commands and Utilities Reference - z/VM - IBM

DUPLEX
Sometimes a cache storage subsystem will not notify CP when it has established or
re-established a duplex pair. When this occurs, the appropriate command response
cannot be generated. Under these circumstances, command processing is ended
after generating the following response:
Command results lost:
DUPLEX prdev ON srdev {COPY } PACE nnn [SECVolid volid]
{RESYNCH}
Then the QUERY DUPLEX command can be issued to determine the status of the
duplex pair.
Errors can occur during the asynchronous processing of the DUPLEX command. If
these errors prevent the successful completion of the command, the following
response will be displayed:
Command failed:
DUPLEX prdev ON srdev {COPY } PACE nnn [SECVolid volid]
{RESYNCH}
Response to System Operator: If the originator of the DUPLEX ON command is not
the system operator, this response will be issued to the system operator when the
duplex pair has been established or re-established.
Duplex pair (prdev,srdev) was activated by userid.
where:
prdev
is the real device number of the primary volume in the duplex pair.
srdev
is the real device number of the secondary volume in the duplex pair.
userid
is the ID of the user who issued the command.
Response 2:
Duplex pair (prdev,srdev) - suspended
This response is displayed when DUPLEX SUSPEND command is issued to place
a duplex pair in the suspended duplex state.
where:
prdev
is the real device number of the primary volume in the duplex pair.
srdev
is the real device number of the secondary volume in the duplex pair.
If the originator of the command is not the system operator, the following response
will be issued to the system operator.
Duplex pair (prdev,srdev) was suspended by userid.
where:
418 z/VM: CP Commands and Utilities Reference
prdev
is the real device number of the primary volume in the duplex pair.
srdev
is the real device number of the secondary volume in the duplex pair.