HP XP Continuous Access Software - Manual (Page 3)

Contents
1 Overview of HP XP Continuous Access Journal Software..................................8
XP Continuous Access Journal....................................................................................................8
Features..................................................................................................................................9
Benefits...................................................................................................................................9
Business Solutions...................................................................................................................10
2 About XP Continuous Access Journal Operations..........................................11
Functionality Overview............................................................................................................11
Journal Obtain..................................................................................................................12
Journal Copy.....................................................................................................................12
Journal Restore..................................................................................................................12
XP Continuous Access Journal Components................................................................................13
Storage Systems.................................................................................................................14
XP Continuous Access Journal Software.................................................................................14
Logical Disk Controllers.......................................................................................................14
Main and Remote Control Units (Primary Storage Systems and Secondary Storage Systems)........15
Consistency Groups...........................................................................................................15
Remote Copy Connections..................................................................................................16
Initiator Ports and RCU Target Ports.......................................................................................17
Journal Groups..................................................................................................................17
Data Volume Pairs..............................................................................................................18
Journal Volumes.................................................................................................................18
Number of Journal Volumes............................................................................................18
Specifications for Journal Volumes...................................................................................18
Restrictions on Journal Volumes.......................................................................................19
Journal Volume Areas....................................................................................................20
Host Failover Software........................................................................................................20
XP Continuous Access Journal Remote Copy Operations..............................................................21
Initial Copy Operation........................................................................................................21
Update Copy Operation.....................................................................................................22
Journal Group Operations...................................................................................................23
Journal Group Operations..............................................................................................23
Read and Write I/O Operations During XP Continuous Access Journal Operations.....................23
Read / Read Failure......................................................................................................23
Write and Update Copy / Write Failure...........................................................................24
Update Copy Failure.....................................................................................................24
Special XP Continuous Access Journal Software Write Command........................................24
Secondary Data Volume Write Option..................................................................................24
Difference Management.....................................................................................................25
Journal Processing..................................................................................................................25
Journal Processing at the Primary Storage System...................................................................25
Types of Journals...........................................................................................................26
Journal Processing at the Secondary Storage System..............................................................26
Storing Journals at the Secondary Storage System.............................................................26
Selecting and Restoring a Journal at the Secondary Storage System.....................................26
XP Continuous Access Journal Delta Resync Operation.................................................................27
Journal Obtain at XP Continuous Access Synchronous Secondary Site...........................................28
Switching the Master Journal Group of XP Continuous Access Journal............................................30
Pair Status.............................................................................................................................32
Split Types (PSUS)..............................................................................................................38
Suspend Types...................................................................................................................40
Suspension Condition.........................................................................................................41
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