HP storageworks HSG80 Reference Manual page 41

The name of the initiator unit that is to be the first member of the remote copy set.
This unit cannot be involved in a snapshot, and must not be a concatset.
remote-node-name\target-unit-name
The remote-node-name part of the parameter specifies the name of the controller
pair—called a node—receiving the command. The target-unit-name part specifies
the unit on the remote node to be added as the target of the remote copy set.
Switches
The following switches are available with the ADD REMOTE_COPY_SETS
command:
• OPERATION_MODE
• OUTSTANDING_IOS
These switches are described in the following paragraphs:
OPERATION_MODE=SYNCHRONOUS (default)
OPERATION_MODE=ASYNCHRONOUS
This switch determines which of two normal operating modes is assigned to the
remote copy set.
In synchronous mode, write operations must be completed on the remote units of
the remote copy set before the host is informed that the operation is complete.
Synchronous operation assures data consistency at all times among the members
of a remote copy set.
In asynchronous mode, the write operation is reported as complete to the host
before the data is written to the remote units of the remote copy set. Asynchronous
mode gives greater performance and faster response time, but the data on all
members of the remote copy set cannot be assumed to be always the same.
OUTSTANDING_IOS=n (1 to 240; default is 200)
This switch sets the number of outstanding I/O operations from the initiator to the
target. The way this switch operates depends on which operating mode is set by
the OPERATION_MODE switch:
• In synchronous mode, OUTSTANDING_IO refers to the number of remote
writes (write operations from the initiator to the target) that can be
outstanding.
HSG80 Array Controller V8.7 Command Line Interface Reference Guide
ADD REMOTE_COPY_SETS
2–25