Designing Disaster Tolerant High Availability Clusters:

List of Figures

1-1 High Availability Architecture.

1-2 Disaster Tolerant Architecture

1-3 Extended Distance Cluster

1-4 Metropolitan Cluster

1-5 Continental Cluster

1-6 Cascading Failover Data Center Distribution Using XP CA

1-7 Cascading Failover Data Center Distribution Using EMC SRDF

1-8 Physical Data Replication

1-9 Logical Data Replication

1-10 Alternative Power Sources

1-11 Reliability of the Network is Paramount

1-12 Highly Available FDDI Network: Two Options

1-13 Routing Highly Available Ethernet Connections in Opposite Directions

2-1 Two Data Centers with FibreChannel Hubs

2-2 Two Data Centers with FibreChannel Switches and FDDI

2-3 Two Data Centers with DWDM Network and Storage

2-4 Two Data Centers and Third Location with DWDM and Arbitrators

2-5 Two Data Centers and Third Location with DWDM and Quorum Server

3-1 Two Data Centers and Third Location with Arbitrators

3-2 Failover Scenario with a Single Arbitrator

3-3 Failover Scenario with Two Arbitrators

3-4 EMC R1 and R2 Definitions

3-5 2 by 1 Node and Data Center Configuration

3-6 2 by 2 Node and Data Center Configuration

3-7 Bidirectional 2 by 2 Configuration

3-8  Disaster Tolerant Checklist

3-9  Cluster Configuration Worksheet

3-10  Package Configuration Worksheet

3-11  Package Control Script Worksheet

4-1 Sample Continentalclusters Configuration

4-2 Sample Mutual Recovery Configuration

4-3 Continental Cluster After Recovery

4-4 Sample Local Cluster Configuration

4-5 Sample Cluster Configuration with Recovery Packages

4-6 Sample Continentalclusters Recovery Groups

4-7 Sample Bi-directional Recovery Groups

4-8 Continentalclusters Configuration Files

4-9 Recovery Checklist

4-10 Oracle RAC Instances in a Continentalclusters Environment

4-11 Sample Oracle RAC Instances in a Continentalclusters Environment After Failover

5-1 XP Series Primary and Secondary Volume Definitions

5-2 XP Series Disk Array Side File

5-3 Disaster Tolerant Cluster

6-1 Sample syminq Output from a Node on the R1 Side

6-2 Sample syminq Output from a Node on the R2 Side

6-3 Parsing the Symmetrix Serial Number

6-4 Sample symrdf list Output from R1 Side

6-5 Sample symrdf list Output from R2 Side

6-6 Mapping HP-UX Device File Names to Symmetrix Units

6-7 2 X 2 Node and Data Center Configuration with Consistency Groups

6-8 Devices and Symmetrix Units in M by N Configurations

7-1 Continental Cluster with Cascading Failover

7-2 Symmetrix Configuration for Cascading Failover

7-3 Example of Symmetrix Device Setup

7-4 Primary Device Group

7-5 Secondary Device Group

7-6 Recovery Device Group

7-7 Mirroring from the Primary to the Secondary Symmetrix

7-8 Mirroring from the Secondary to the Recovery Symmetrix

7-9 Data Refresh in Steady State

7-10 Failure of Primary Site in Primary Cluster

7-11 Failure of Secondary Site in Primary Cluster

7-12 Failure of Entire Primary Cluster