HP 3PAR Operating System Software - Manual (Page 6)

Setting Volume Group Policies...........................................................................................118
Automatically Restarting Volume Groups........................................................................119
Generating Alerts for Slow Resynchronization of Asynchronous Periodic Volume Groups.......119
Volume Group Modes......................................................................................................120
Overview of Volume Group Modes................................................................................120
Synchronous Mode......................................................................................................120
Advantages of Synchronous Mode............................................................................121
Latency in Synchronous Mode..................................................................................121
Asynchronous Periodic Mode........................................................................................121
Advantages of Asynchronous Periodic Mode..............................................................122
Synchronization...............................................................................................................122
Types of Synchronization..............................................................................................123
Limits on Volumes that Concurrently Synchronize..............................................................123
Asynchronous Periodic Mode Volume Groups..................................................................123
Full Synchronization................................................................................................124
Resynchronization...................................................................................................125
Setting Up Resynchronization for Asynchronous Periodic Mode.....................................126
Setting the Synchronization Period........................................................................126
Considerations for Setting the Synchronization Period.............................................127
Synchronous Mode Volume Groups...............................................................................127
Full Synchronization................................................................................................127
Resynchronization...................................................................................................127
16 Optimizing Performance....................................................................128
Avoiding RCIP Throughput Issues during Initial Synchronization..............................................128
Optimizing RCIP Synchronization Speed over Distances........................................................128
Optimizing RCIP Throughput by Increasing MTU Size...........................................................128
Limiting Throughput..........................................................................................................129
Limiting Throughput for Asynchronous Periodic Volume Groups..........................................129
Removing Throughput Limits..........................................................................................130
Troubleshooting RCIP Autonegotiation Issues........................................................................130
Distribution of Host Writes over RCIP GigE Links...................................................................131
17 HP 3PAR Peer Persistence with Transparent Failover................................132
HP 3PAR Quorum Witness Requirements.............................................................................132
HP 3PAR Quorum Witness Components..............................................................................133
HP 3PAR Peer Persistence..................................................................................................134
Manual Transparent Switchover.....................................................................................137
Automatic Transparent Failover......................................................................................141
HP 3PAR Peer Persistence Quorum.....................................................................................141
VMware vSphere Metro Storage Cluster Configuration.....................................................142
Handling Automatic Transparent Failover........................................................................143
Link and Communication Failure Scenarios.....................................................................144
Communication Failure—Array to Array....................................................................144
Communication Failure—Site 1 to Quorum Witness....................................................145
Communication Failure—Site 1 to Quorum Witness and Site 1 to Site 2........................146
Communication Failure—Site 2 to Quorum Witness....................................................146
Communication Failure—Site 2 to Quorum Witness and Site 1 to Site 2........................147
No Communication on the Part of Quorum Witness with Site 1 and Site 2.....................148
No Communication among Quorum Witness, Site 1, and Site 2...................................148
Path Management Policies.................................................................................................149
Peer Persistence Coexistence with Other Remote-Copy Groups...............................................150
18 Using Tape for Initial Synchronization and Backup.................................151
19 Managing VASA-connected Remote-Copy Groups and Volumes..............153
Creating Remote-Copy Groups with Associated Local and Remote CPGs.................................153
6 Contents