Contents

List of Figures

List of Tables

Title and Copyright Information

Preface

• Audience
• Prerequisites
• About This Book
• How Do I Choose a Solution for My Needs?
• Documentation Accessibility

What's New?

1 Introduction to Disaster Recovery

• Defining the Recovery Time Objective (RTO)
• Defining the Recovery Point Objective (RPO)
• Handling Temporary Outages
• Key Concept: Synchronization Point Recovery
• Relating RPO to Synchronization Point Recovery
• Planning for Data High Availability (D-HA)
  • Highly-Available Physical Tape
  • Highly-Available Virtual Tape
  • D-HA and Synchronization Point Recovery
• Conducting True Disaster Recovery
• Planning for DR Testing
  • Data Movement for DR Testing
• DR Testing With Physical Export/Import
• DR Testing With CDRT
• DR Testing with VSM Cross-Tape Replication

2 Doing Physical Exports and Imports

• Exporting and Importing by Management Class
  • Example: Exporting by Management Class from the Source VSM System
  • Example: Importing by Management Class into the Target VSM System
• Exporting and Importing by Storage Class
  • Example: Exporting by Storage Class from the Source VSM System
  • Example: Importing by Storage Class into the Target VSM System
• Export/Import for VLE

3 Using the ELS External Vaulting Feature

• Preparing for ELS External Vaulting
  • Creating MVCs for DR and LTR
  • DELSCR Considerations When Using the Vaulting Feature
  • What Happens When Vaulted Volumes Return to the ACS?
• Vaulting MVCs for DR
  • Basic DR Vaulting with MVCs
    • Step 1 – Creation of Vault VTVs/MVCs
    • Step 2 – Exporting the Vault MVCs
    • Step 3 – (Optional) Write Additional Datasets to Manifest File Tape
    • Step 4 – Eject Vault MVCs
    • Step 5 - Eject Native Volumes (Including Manifest File Tape)
    • Step 6 – Create a Pull List of Volumes for Return from the Vault
    • Step 7 – Prepare Vaulted MVCs for Return
    • Step 8 – Prepare Vaulted Native Volumes for Return
    • Step 9 - Entering Returned Volumes
  • Multiple Week DR Vaulting with MVCs
  • DR Vaulting with MVCs in a Remote Library
• Vaulting MVCs for LTR
• Ejecting Specific Volumes to a Local (Floor) Vault

4 Using Cross-TapePlex Replication in a DR Solution

• How Does CTR Work?
• CTR VTV Read-Only Considerations
• Configuring for CTR
  • The Setup: Configuring and Starting CTR
  • Defining Policies for CTR
    • Policies for the Sending TapePlex
    • Policies for the Receiving TapePlex
  • Using CTR When the Remote Site Has No LPARs
• Using CTR as a DR Solution
  • Using CTR for Business Continuance
  • Using CTR for Business Resumption
  • Disaster Recovery Testing Using Cross-Tapeplex Replication
  • DR Testing When the DR Site Has No LPARs
  • Managing VTVs Replicated Using Cross-TapePlex Replication (CTR)

5 Configuring a Remote Library

• Modifying the SMC SCMDS File
• Updating the VTCS CONFIG Deck to Define a Remote Library
  • MVC Pool Considerations

6 Using Clustered VTSS Configurations

• What is Clustered VTSS?
• Clustered VTSS Requirements
• How Clustered VTSS Configurations Work
  • How VTSS Reconciliation Works
• Uni-Directional and Bi-Directional Clusters
  • Uni-Directional Clusters
    • How Uni-Directional VTSS Clusters Work
  • Bi-Directional Clusters
    • How Bi-Directional VTSS Clusters Work
• Extended Clustering
• Synchronous or Asynchronous Replication
  • Implementing Synchronous Replication
  • Implementing Asynchronous Replication with Job Monitoring
• Clustering with TCP/IP Connections
  • The TCP/IP Environment
  • Configuring VTCS for TCP/IP CLINKs
    • CONFIG CLINK Statement

7 Using the Concurrent Disaster Recovery Test Software

• Metadata Considerations
• Where Does CDRT Get Its VTV Data?
  • What Happens to Data When the Test is Over?
• Managing CDRT Resources
  • Volume Resources
    • Scratch Subpools
    • MVC Resources
  • VTSS Resources
    • Non-shared VTSS Resources
      • Clustered VTSS in CDRT
      • Preparing a VTSS Cluster for a DR Test:
      • Managing VTSS Contents Before and After the DR Test
    • Shared VTSS Resources
  • ACS Resources
    • DR Test ACS Restrictions
      • DR Production Host Requirements
      • DR Test Host Requirements
  • VLE Resources
  • VTCS Policies
    • Defining MGMTCLAS/STORCLAS for Non-Shared VTSSs
    • Defining MGMTCLAS for Shared VTSSs
  • Optimizing Access to Test and Production Resources
  • Running a DR Test
• Cleaning Up After a DR Test
  • Cleaning Up After a DR Test
  • Resuming Normal Operations
• Operational Scenarios
  • Scenario 1: Production and Test Sites, ACS at Each Site, Spare VTSS at Test Site
    • Example JCL for Scenario 1
  • Scenario 2: Production and Test Sites, ACS at Each Site, VTSS Takeover at Test Site
    • Example JCL for Scenario 2
  • Scenario 3: Production and Test Sites, ACS at Each Site, No VTSSs
    • Example JCL for Scenario 3
  • Scenario 4: Clustered VTSSs with Production and DR Test Sites
    • Example JCL for Scenario 4
  • Scenario 5: Production and Test Sites, ACS and VLE at Each Site
    • Example JCL for Scenario 5
  • Scenario 6: Production and Test Sites, VLE Only at Each Site
    • Example JCL for Scenario 6
  • Scenario 7: Clustered VTSSs (Tapeless) with Production and DR Test Sites
    • Example JCL for Scenario 7

8 Creating System Recovery Points in VSM Environments

• Checkpointing Examples
  • Example 1: Local MVC Copies and Remote MVC Copies
  • Example 2: Using CONFIG RECLAIM PROTECT

9 Using VLE for Disaster Recovery

• Normal Production Mode
• Running a DR Test with VLE
• Cleanup After a DR Test with VLE
• Using VLE for Business Continuance

A Clustered VTSS Examples

• Uni-Directional Clustered VTSS
  • Configuring and Managing a Uni-Directional Clustered VTSS System
• Bi-Directional Clustered VTSS
  • Configuring and Managing a Bi-Directional Clustered System
• Extended Clustering
  • Configuring and Managing a 3 VTSS Clustered System
• VSM5 to VSM5 Cluster with TCP/IP CLINKs
• VSM5 to VSM 6 Cluster with TCP/IP CLINKs, Cross-Connected VLEs
• VSM 6 to VSM 6 ”Tapeless” Cluster with TCP/IP CLINKs
• Should you Use Uni-Directional or Bi-Directional?

Glossary

Index