HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

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Initiator Ports and RCU Target Po rts

The initiator p

ort and the RCU target port a re required at both the primary storage system and secondary

storagesystem. Theinitiator port at theprimary storagesystemisconnected to theRCU target port

at the secondary storage system via the Fibre Channel interface. The initiator port at the secondary

storage system is connected to the RCU target port at the primary storage system. The initiator port at the

secondary sto

rage system issues a read journal c omm and to the primary storage system, and then the

RCU target port at the primary storage system sends journal data to the secondary storage system in

response to the read journal c om m and.

Any Fibre Chan

nel

interface port on the storage system can be conﬁgured as an initiator por t. The

initiator ports ca nnot communicate with the host processor channels. The host channel paths must be

connected to the Fibre Channel interface por t other than the initiator port.

Note:

Two or mo

re initiator ports must be conﬁgured before you can add the secondary storage systems

and create the Continuous Access Journal 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”onpage96for informationonconﬁgu ring the host interface p ort.

Journal Groups

A journal group cons ists of t wo or more data volumes and journal volumes. You can use this journal

group to tailor Continuous Access Journal to your unique business content. The journal volume in the

primary storage system is referred to as the master journal volume. The journal volume in the secondary

storage system is referred to as the restore journal volume. The data volume in the master journal group is

also called the primary data volume. The journal volume in the master journal group is called the master

journal volume. The data volume in the restore journal group is similarly called the secondary data

volume. The journal volume in the restore journal group is called the restore journal volume.

The data update sequence from the host is managed by the journal group. The d ata update sequence

consistency bet ween the master and restore journal groups to be paired is maintained and ensured. The

master and restore journal groups are managed according to the journal group number. The journal

numbers of master and restore journal groups that are paired can be different. One data volume and one

journal volume can belong to only one journal group.

Caution:

Data volumes and journal volumes that belong to different LDKCs cannot c oexist in a journal

group.

For detailed information about the speciﬁcation of journal groups, see Table 15 on page 45.

Data Volume Pairs

Continu

ous Access Journal performs remote copy operations for data volume pairs created by the user.

Each Continuous Access Journal pair consists of one primary data volume and one secondary data

volume which can be located in d ifferent storage systems. The Continuous Access Journal primary data

volume

are the primary volumes (LUs) which contain the original data, and the Continuous Access

Journal secondar y data volumes are the secondary volumes (LUs) which contain the b ackup or duplicate

data. During normal Continuous Access Journal operations, the primary data volume remains available

to all

hosts at all tim es for read and write I/O operations. During normal Continuous Access Journal

operations, the secondar y storage system rejects all host-requested write I/Os for the secondary d ata

volum

e. The secondary data volume write enable option allows write access to a secondary data volume

while the pair is split, and uses the secondary data volume and primary data volume track maps to

resynchronize the pair (see “Secondar y Da ta Volume Write Option” on page 29).

Continuous Access Journal also supports LUN Expansion (LUSE) Virtual LVI/LUN (VLL) and Cache

Resid

ency Manager features, so that Continuous Acc ess Jou rnal me ets a variety of user needs and

faci

litates data copying and data migration. This ensures that all user data ca n be backed up or

dupl

icated. See “Logical Unit (LU) Types” on page 42 for further information on LU requirements and

support.

About

Continuous Access Journal Operations