HP XP P9000 Continuous Access Journal for Mainframe Systems User Guide

Establishing connections between multiple secondary systems .................................................35
Planning extended consistency groups (EXCTG) ....................................................................36
Planning for previous models ...................................................................................................36
Guidelines for preparing systems for Cnt Ac-J Z .........................................................................37
System option modes .........................................................................................................38
4 Planning the data path..............................................................................41
Data path design workflow .....................................................................................................41
Sizing bandwidth ..................................................................................................................41
Five sizing strategies ..........................................................................................................41
Calculating bandwidth ......................................................................................................42
Sizing bandwidth for peak write-workload........................................................................42
Sizing bandwidth for peak rolling average write-workload..................................................44
Latency .......................................................................................................................46
Packet loss ...................................................................................................................46
Planning ports for data transfer ................................................................................................46
Port types..........................................................................................................................47
Determining required number of ports ..................................................................................48
Cable length and switch requirements.......................................................................................48
Supported data path configurations .........................................................................................49
5 Using extended consistency groups.............................................................51
Overview .............................................................................................................................51
Registering journals in an EXCTG .............................................................................................53
Splitting, restoring, releasing pairs in an EXCTG ........................................................................54
Pair-split operation.............................................................................................................54
Operations for a specific journal .........................................................................................54
Removing journals from an EXCTG ...........................................................................................55
Forcibly removing journals...................................................................................................56
Using EXCTGs with P9500.......................................................................................................56
6 Configuration operations...........................................................................59
Configuration workflow ..........................................................................................................59
Defining fibre-channel port attributes ........................................................................................59
Configuring local and remote systems for Cnt Ac-J Z ...................................................................60
Configuring additional logical paths ........................................................................................62
Specifying number of concurrent initial/resync copies..................................................................63
Registering journal volumes in a journal ....................................................................................65
7 Pair operations.........................................................................................68
Pair operations workflow.........................................................................................................68
Checking pair status...............................................................................................................68
Creating the initial copy .........................................................................................................68
Splitting pairs ........................................................................................................................72
Splitting mirrors .....................................................................................................................73
Creating point-in-time copies ...................................................................................................74
Restoring pairs ......................................................................................................................74
Resynchronizing mirrors ..........................................................................................................76
Deleting pairs .......................................................................................................................76
Deleting pairs in a mirror ........................................................................................................78
8 Monitoring the system...............................................................................80
Monitoring pair activity and status............................................................................................80
Pair status definitions..........................................................................................................80
Additional information on pair status...............................................................................83
Suspend types..............................................................................................................83
Suspension conditions on secondary system......................................................................85
4 Contents