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NOTE:

Two or more initiator ports must be conﬁgured before you can add the secondary storage systems and

create the URz volume pairs.

The ﬁbre-channel interface ports that are assigned for the RCU target ports can be connected to the

host channel paths via the ﬁbre-channel switch.

See Conﬁguring Port Attributes on page 112Conﬁguring Port Attributes for the information on conﬁguring

host interface port.

Remote Copy Operations

Figure 4 on page 30 illustrates the two types of URz remote copy operations: initial copy and update

copy.

Primary host

Obtaining updated

journal data

Update copy

Write instruction

Secondar

host

Initial copy

Obtaining base-journal

Primary storage system

Secondary storage system

Restore

Secondary

data

volume

Restore

journal

volume

Primary

data

volume

Master

journal

volume

Figure 5 Remote Copy Operations

This section describes the following topics that are related to remote copy operations with URz:

• Initial copy operation (see the next section)

• Update copy operation

• Read and write I/O operations for URz volumes

• Secondary data volume write option

• Secondarydatavolumereadoption

• Difference management

Initial Copy Operations

Initial copy operations synchronize data in the primary data volume and data in the secondary data

volume. Initial copy operations are performed independently from host I/Os. Initial copy operations

are performed when you create a data volume pair or when you resynchronize a suspended pair. The

initial copy operation copies the base-journal data that is obtained from the primary data volume at

the primary storage system to the secondary storage system, and then restores the base-journal to the

secondary data volume.

Overview of Universal Replicator Operations

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