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Designing Disaster Tolerant HA Clusters Using Metrocluster and Continentalclusters:
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HP Part Number: B7660-90021
September 2007
Legal Notices
Table of Contents
Printing History
Preface
Guide to Disaster Tolerant Solutions Documentation
1 Designing a Metropolitan Cluster
Designing a Disaster Tolerant Architecture for use with Metrocluster Products
Single Data Center
Two Data Centers and Third Location with Arbitrator(s)
Worksheets
Disaster Tolerant Checklist
Cluster Configuration Worksheet
Package Configuration Worksheet
Next Steps
2 Designing a Continental Cluster
Understanding Continental Cluster Concepts
Mutual Recovery Configuration
Application Recovery in a Continental Cluster
Monitoring over a Network
Cluster Events
Interpreting the Significance of Cluster Events
How Notifications Work
Alerts
Alarms
Creating Notifications for Failure Events
Creating Notifications for Events that Indicate a Return of Service
Performing Cluster Recovery
Notes on Packages in a Continental Cluster
How Serviceguard commands work in a Continentalclusters
Designing a Disaster Tolerant Architecture for use with Continentalclusters
Mutual Recovery
Serviceguard Clusters
Data Replication
Highly Available Wide Area Networking
Data Center Processes
Continentalclusters Worksheets
Preparing the Clusters
Setting up and Testing Data Replication
Configuring a Cluster without Recovery Packages
Configuring a Cluster with Recovery Packages
Building the Continentalclusters Configuration
Preparing Security Files
Creating the Monitor Package
Editing the Continentalclusters Configuration File
Checking and Applying the Continentalclusters Configuration
Starting the Continentalclusters Monitor Package
Validating the Configuration
Documenting the Recovery Procedure
Reviewing the Recovery Procedure
Testing the Continental Cluster
Testing Individual Packages
Testing Continentalclusters Operations
Switching to the Recovery Packages in Case of Disaster
Receiving Notification
Verifying that Recovery is Needed
Using the Recovery Command to Switch All Packages
To Start the Failover Process
How the
cmrecovercl
Command Works
Forcing a Package to Start
Restoring Disaster Tolerance
Restore Clusters to their Original Roles
Primary Packages Remaining on the Surviving Cluster
Primary Packages Remaining on the Surviving Cluster using
cmswitchconcl
Newly Created Cluster Will Run Primary Packages
Newly Created Cluster Will Function as Recovery Cluster for All Recovery Groups
Maintaining a Continental Cluster
Adding a Node to a Cluster or Removing a Node from a Cluster
Adding a Package to the Continental Cluster
Removing a Package from the Continental Cluster
Changing Monitoring Definitions
Checking the Status of Clusters, Nodes, and Packages
Reviewing Messages and Log Files
Deleting a Continental Cluster Configuration
Renaming a Continental Cluster
Checking Java File Versions
Next Steps
Support for Oracle RAC Instances in a Continentalclusters Environment
Configuring the Environment for Continentalclusters to Support Oracle RAC
Serviceguard/Serviceguard Extension for RAC and Oracle Clusterware Configuration
Initial Startup of Oracle RAC Instance in a Continentalclusters Environment
Failover of Oracle RAC Instances to the Recovery Site
Failback of Oracle RAC Instances After a Failover
3 Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with Continuous Access XP
Files for Integrating XP Disk Arrays with Serviceguard Clusters
Overview of Continuous Access XP Concepts
PVOLs and SVOLs
Device Groups and Fence Levels
Continuous Access Journal Overview
Creating the Cluster
Preparing the Cluster for Data Replication
Creating the RAID Manager Configuration
Defining Storage Units
Configuring Packages for Disaster Recovery
Completing and Running a Metrocluster Solution with Continuous Access XP
Maintaining a Cluster that uses Metrocluster with Continuous Access XP
XP Continuos Access Device Group Monitor
Completing and Running a Continental Cluster Solution with Continuous Access XP
Setting up a Primary Package on the Primary Cluster
Setting up a Recovery Package on the Recovery Cluster
Setting up the Continental Cluster Configuration
Switching to the Recovery Cluster in Case of Disaster
Failback Scenarios
Maintaining the Continuous Access XP Data Replication Environment
4 Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with Continuous Access EVA
Files for Integrating the EVA with Serviceguard Clusters
Overview of EVA and Continuous Access EVA Concepts
Data Replication
Copy Sets
DR Groups
Log Disk
Managed Sets
Failover
Continuous Access EVA Management Software
Preparing a Serviceguard Cluster for Metrocluster Continuous Access EVA
Setting up the Storage Hardware
Cluster Configuration
Management Server/SMI-S and DR Groups Configuration
Defining Management Server and SMI-S Information
Defining EVA Storage Cells and DR Groups
Verifying the EVA Configuration
Configuring Volume Groups
Building a Metrocluster Solution with Continuous Access EVA
Configuring Packages for Automatic Disaster Recovery
Maintaining a Cluster that Uses Metrocluster Continuous Access EVA
Completing and Running a Continental Cluster Solution with Continuous Access EVA
Setting up a Primary Package on the Primary Cluster
Setting up a Recovery Package on the Recovery Cluster
Setting up the Continental Cluster Configuration
Switching to the Recovery Cluster in Case of Disaster
Failover to Recovery Site
Failover Scenarios
5 Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with EMC SRDF
Files for Integrating Serviceguard with EMC SRDF
Overview of EMC and SRDF Concepts
Preparing the Cluster for Data Replication
Installing the Necessary Software
Building the Symmetrix CLI Database
Determining Symmetrix Device Names on Each Node
Building a Metrocluster Solution with EMC SRDF
Setting up 1 by 1 Configurations
Grouping the Symmetrix Devices at Each Data Center
Setting up M by N Configurations
Creating Symmetrix Device Groups
Configuring Gatekeeper Devices
Creating the Consistency Groups
Creating Volume Groups
Creating VxVM Disk Groups using Metrocluster with EMC SRDF
Validating VxVM Disk Groups using Metrocluster with EMC SRDF
Additional Examples of M by N Configurations
Configuring Serviceguard Packages for Automatic Disaster Recovery
Maintaining a Cluster that uses Metrocluster with EMC SRDF
Managing Business Continuity Volumes
R1/R2 Swapping
Some Further Points
Metrocluster with SRDF/Asynchronous Data Replication
Overview of SRDF/Asynchronous Concepts
Requirements for using SRDF/Asynchronous in a Metrocluster Environment
Preparing the Cluster for SRDF/Asynchronous Data Replication
Configuring Metrocluster with EMC SRDF using SRDF/Asynchronous
Building a Device Group for SRDF/Asynchronous
Package Configuration using SRDF/Synchronous or SRDF/Asynchronous
Package Failover using SRDF/Asynchronous
Protecting against a Rolling Disaster
Limitations and Restrictions
Building a Continental Cluster Solution with EMC SRDF
Setting up a Primary Package on the Primary Cluster
Setting up a Recovery Package on the Recovery Cluster
Setting up the Continental Cluster Configuration
Switching to the Recovery Cluster in Case of Disaster
Failback Scenarios
Maintaining the EMC SRDF Data Replication Environment
6 Designing a Disaster Tolerant Solution Using the Three Data Center Architecture
Overview of Three Data Center Concepts
Designing a Disaster Tolerant Architecture Using Three Data Center with Continuous Access XP
Overview of HP XP StorageWorks Three Data Center Architecture
Configuring an XP Three Data Center Solution
HP StorageWorks RAID Manager Configuration
Package Configuration in a Three Data Center Environment
Timing Considerations
Bandwidth for Continuous Access and Application Recovery Time
Data Maintenance with the Failure of a Metrocluster Continuous Access XP Failover
Swap Takeover Failure (for Continuous Access Sync Pair)
Takeover Timeout (for third data center)
Continuous Access-Journal Device Group PVOL-PAIR with SVOL-PSUS(SSWS) State
Failback Scenarios
Failback from Data Center 3 (DC3)
Additional Reading
A
Environment File Variables for Serviceguard Integration with Continuous Access XP
B Environment File Variables for Metrocluster Continuous Access EVA
C Environment File Variables for Metrocluster with EMC SRDF
D Configuration File Parameters for Continentalclusters
E Continentalclusters Command and Daemon Reference
Glossary
Index
List of Figures
1-1
Two Data Centers and Third Location with Arbitrators
1-2
Failover Scenario with a Single Arbitrator
1-3
Failover Scenario with Two Arbitrators
1-4
Disaster Tolerant Checklist
1-5
Cluster Configuration Worksheet
1-6
Package Configuration Worksheet
1-7
Package Control Script Worksheet
2-1
Sample Continentalclusters Configuration
2-2
Sample Mutual Recovery Configuration
2-3
Continental Cluster After Recovery
2-4
Multiple Recovery Pair Configuration in a Continental Cluster
2-5
Sample Local Cluster Configuration
2-6
Sample Cluster Configuration with Recovery Packages
2-7
Sample Continentalclusters Recovery Groups
2-8
Sample Bi-directional Recovery Groups
2-9
Continentalclusters Configuration Files
2-10
Recovery Checklist
2-11
Oracle RAC Instances in a Continentalclusters Environment
2-12
Sample Oracle RAC Instances in a Continentalclusters Environment After Failover
2-13
Continentalclusters Configuration Files in a Recovery Pair with RAC Support
3-1
XP Series Primary and Secondary Volume Definitions
3-2
XP Series Disk Array Side File
3-3
Journal Based Replication
3-4
Disaster Tolerant Cluster
3-5
Q-Marker and Q-CNT
4-1
Configuration of Virtual Disks and DR groups
4-2
EVA Configuration Checklist
4-3
EVA Command View for the WWN Identifier
4-4
EVA Command View DR Group Properties
5-1
EMC R1 and R2 Definitions
5-2
Sample
syminq
Output from a Node on the R1 Side
5-3
Sample
syminq
Output from a Node on the R2 Side
5-4
Parsing the Symmetrix Serial Number
5-5
Sample
symrdf
list
Output from R1 Side
5-6
Sample
symrdf
list
Output from R2 Side
5-7
Mapping HP-UX Device File Names to Symmetrix Units
5-8
2 X 2 Node and Data Center Configuration with Consistency Groups
5-9
Devices and Symmetrix Units in M by N Configurations
5-10
2 by 1 Configuration
5-11
Bidirectional 2 by 2 Configuration
5-12
SRDF/Asynchronous Basic Functionality
5-13
Metrocluster Topology using SDRF/Asynchronous
6-1
Three Data Center Solution Overview
6-2
Three Data Center Architecture
6-3
XP Three Data Center Multi-Target Bi-Link Configuration Data Replication
6-4
3DC Multi-Hop Bi-Link Configuration Data Replication
6-5
Mirror Unit Descriptors
6-6
Mirror Unit Desciptor Usage
6-7
Multi-Target Bi-Link (1:2)
6-8
Multi-Hop Bi-Link (1:1:1)
List of Tables
1
Editions and Releases
2
Disaster Tolerant Solutions Document Road Map
1-1
Supported System and Data Center Combinations
1-2
Node Failure Scenarios with One Arbitrator
1-3
Node Failure Scenarios with Two Arbitrators
2-1
Monitored States and Possible Causes
2-2
Serviceguard and Continentalclusters Commands
2-3
Data Replication and Continentalclusters
2-4
Continentalclusters Data Replication Package Structure
2-5
Status of Continentalclusters Packages Before Recovery
2-6
Status of Continentalclusters Packages After Recovery
2-7
Supported Continentalclusters and RAC Configuration
3-1
Metrocluster/Continuous Access Template Files
4-1
Metrocluster Continuous Access EVA Template Files
4-2
Individual Management Server Information
5-1
Metrocluster with EMC SRDF Template Files
5-2
Mapping for a 4 Node Cluster connected to 2 Symmetrix Arrays
5-3
RETRY and RETRYTIME Values
A-1
AUTO_FENCEDATA_SPLIT
A-2
AUTO_NONCURDATA
A-3
AUTO_PSUEPSUS
A-4
AUTO_PSUSSSSWS
A-5
AUTO_SVOLPFUS
A-6
AUTO_SVOLPSUE
A-7
AUTO_SVOLPSUS
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