Table Of Contents - HP StorageWorks P9000 User Manual

Contents
1 Continuous Access Synchronous overview......................................................7
How Continuous Access Synchronous works ................................................................................7
Typical components .................................................................................................................8
Storage systems .......................................................................................................................8
Primary (MCU), secondary (RCU) systems...............................................................................9
Volume pairs ...........................................................................................................................9
Data path .............................................................................................................................10
Consistency groups ................................................................................................................10
Interfaces ..............................................................................................................................10
Failover software ...................................................................................................................11
Overview of initial, update copy operations ..............................................................................11
Initial copy .......................................................................................................................11
Update copy ....................................................................................................................12
2 Requirements and specifications.................................................................13
System requirements ...............................................................................................................13
3 Planning for Continuous Access Synchronous...............................................15
Preparing P9500 systems.........................................................................................................15
Ensuring adequate cache....................................................................................................15
Installing or removing cache memory or shared memory.........................................................15
Using an earlier model storage system..................................................................................15
Planning for system performance..............................................................................................16
Planning volume pairs.............................................................................................................17
Volume pair requirements and recommendations....................................................................17
Planning I/O to the S-VOL..................................................................................................18
Managing differential data.................................................................................................18
Maximum number of pairs supported...................................................................................19
Calculating maximum number of pairs.............................................................................19
Priority set for initial copy operations and scheduling order.....................................................20
Planning data paths................................................................................................................22
Amount of bandwidth required............................................................................................22
Fibre Channel requirements.................................................................................................22
Supported data path configurations.....................................................................................23
Planning ports...................................................................................................................24
Port requirements...........................................................................................................25
Planning consistency groups.....................................................................................................25
Consistency group requirements...........................................................................................25
Ensuring consistent status for pair suspensions, path failure......................................................26
Other split/suspend behavior with consistency groups.......................................................27
Host failover software..............................................................................................................27
4 Sharing Continuous Access Synchronous volumes.........................................29
Volume types that can be shared with Continuous Access Synchronous..........................................29
Continuous Access Journal.......................................................................................................30
Business Copy........................................................................................................................31
Configurations with Business Copy P-VOLs.............................................................................31
Configurations with Business Copy S-VOLs............................................................................32
Status reporting, data currency............................................................................................32
Contents 3