Chapter 34 Further Reading: COBOL-to-Cloud Patterns

Tier 1: Verified IBM Documentation

Cloud Integration and Hybrid Architecture

IBM Wazi as a Service IBM's cloud-hosted z/OS development and test environment running on IBM Cloud. Provides a genuine z/OS instance (not emulation) for COBOL development and testing. Relevant to Section 34.3's discussion of dev/test on cloud — Wazi represents the IBM-native alternative to Micro Focus for cloud dev/test. Available at: IBM Documentation (https://www.ibm.com/docs/en/wazi-aas)

IBM z/OS Connect EE The API mediation layer that exposes CICS and IMS transactions as REST APIs. Central to the hybrid architecture patterns in Section 34.5 (Pattern 3: API-Mediated Real-Time). Documentation covers security configuration, performance tuning, and integration with cloud API gateways. Available at: IBM Documentation (https://www.ibm.com/docs/en/zos-connect)

IBM InfoSphere Data Replication (CDC) Documentation for IBM's Change Data Capture solution. Relevant to Section 34.5's Pattern 2 (CDC data synchronization). Covers DB2 log reader configuration, target database setup, and replication monitoring. Available at: IBM Documentation (https://www.ibm.com/docs/en/idr)

IBM Z and Cloud Modernization Center IBM's comprehensive resource for hybrid cloud architectures involving z/OS. Includes reference architectures, TCO calculators, and patterns for integrating mainframe workloads with AWS, Azure, and GCP. Available at: https://www.ibm.com/z/modernization

Pricing and TCO

IBM Tailored Fit Pricing for z/OS Documentation for IBM's alternative pricing models — Enterprise Consumption Solution and Enterprise Capacity Solution. Essential reading for Section 34.6's TCO analysis, particularly the discussion of R4HA peak, marginal MIPS cost, and the impact of removing off-peak workloads on software licensing. Available at: IBM z Systems pricing documentation

IBM z/OS Container Extensions (zCX) Run Docker containers on z/OS, keeping data close to the mainframe while using cloud-native application patterns. An alternative hybrid approach to moving workloads off-platform — instead, bring cloud-native workloads to the mainframe. Available at: IBM Documentation (https://www.ibm.com/docs/en/zos/latest?topic=zos-container-extensions)

z/OS Architecture References

z/OS MVS Programming: Authorized Assembler Services Reference — I/O Subsystem For readers who want the full technical depth on why z/OS I/O architecture differs from cloud I/O. Covers FICON channels, SAPs (System Assist Processors), and the I/O subsystem's overlapped processing model. Available at: IBM Documentation — z/OS library

Parallel Sysplex: Overview of the Coupling Facility The definitive reference on why Coupling Facility capabilities (lock structure, group buffer pool, list structure) cannot be replicated by distributed software. Essential context for Section 34.4's discussion of data sharing workloads. Available at: IBM Redbooks (search "Parallel Sysplex" at redbooks.ibm.com)

Tier 2: Cloud Provider Documentation

AWS

AWS Mainframe Modernization Service AWS's managed service for rehosting (Micro Focus) and refactoring (Blu Age) mainframe workloads. Includes managed Micro Focus Enterprise Server deployments, automated refactoring tools, and integration with AWS services. Available at: https://aws.amazon.com/mainframe-modernization/

AWS Direct Connect The dedicated network connection between on-premises (including mainframe data centers) and AWS. Critical for the hybrid architectures described in Section 34.5, particularly the API real-time pattern where latency and bandwidth between mainframe and cloud matter. Available at: https://aws.amazon.com/directconnect/

AWS Step Functions Serverless workflow orchestration, used as a JCL scheduling replacement in some cloud COBOL deployments. Relevant to the batch orchestration challenges described in Sections 34.3 and 34.4. Available at: https://aws.amazon.com/step-functions/

Azure

Azure Mainframe and Midrange Migration Microsoft's documentation on migrating mainframe workloads to Azure, including patterns for COBOL rehosting, data migration, and hybrid connectivity. Available at: https://learn.microsoft.com/en-us/azure/cloud-adoption-framework/infrastructure/mainframe-migration/

Azure ExpressRoute Dedicated network connection between on-premises and Azure, equivalent to AWS Direct Connect. Used by Pinnacle Health (Case Study 2) for mainframe-to-Azure connectivity. Available at: https://learn.microsoft.com/en-us/azure/expressroute/

Azure DevTest Labs Lab environment management service used by Pinnacle Health for managing their cloud-based COBOL development environments. Provides auto-start/stop, cost tracking, and environment templating. Available at: https://learn.microsoft.com/en-us/azure/devtest-labs/

GCP

Google Cloud Mainframe Modernization Google's approach to mainframe migration, including partnerships with Micro Focus (now OpenText) and their own Dual Run technology for parallel execution of mainframe and cloud workloads. Available at: https://cloud.google.com/solutions/mainframe-modernization

Tier 3: Vendor Documentation (Rehosting Platforms)

Micro Focus / OpenText

Micro Focus Enterprise Server Documentation Complete documentation for the COBOL rehosting platform discussed in Section 34.2. Covers COBOL compilation, CICS emulation (Enterprise Server CICS), JCL interpretation, VSAM file handling, and cloud deployment options. Available at: OpenText/Micro Focus documentation portal Note: Micro Focus was acquired by OpenText in 2023. Documentation may be transitioning to OpenText branding.

Micro Focus Enterprise Developer The IDE companion to Enterprise Server. Includes Eclipse-based and VS Code-based development environments for COBOL on cloud. Relevant to Section 34.3's discussion of developer accessibility. Available at: OpenText/Micro Focus documentation portal

Heirloom Computing

Heirloom Computing Documentation Documentation for the COBOL-to-Java conversion platform discussed in Section 34.2. Covers the conversion process, Java bytecode output characteristics, and cloud deployment patterns. Note: Heirloom's corporate structure has changed through acquisitions. Search for the most current documentation source.

NTT DATA

NTT DATA UniKix Documentation Documentation for the CICS and batch emulation platform discussed in Section 34.2. Covers CICS API compatibility, batch execution environment, and JCL interpretation. Available at: NTT DATA website (mainframe modernization section)

Tier 4: Industry Publications and Analysis

Analyst Reports

Gartner: "Cloud Migration Strategies for Mainframe Applications" Gartner's analysis of rehosting, refactoring, and replacement strategies for mainframe-to-cloud migration. Their data on migration project failure rates and cost overruns provides context for the TCO analysis in Section 34.6. Note Gartner's finding that "60-70% of rehost projects underestimate total cost by 2-3x" — cited in this chapter and Chapter 32. Access: Requires Gartner subscription.

Forrester: "The Total Economic Impact of Mainframe-to-Cloud Migration" Forrester's TEI methodology applied to mainframe cloud migration. Includes risk-adjusted ROI calculations, hidden cost identification, and benefits quantification. Useful comparison to the TCO framework in Section 34.6. Access: Requires Forrester subscription.

ISG (Information Services Group): "Mainframe Modernization Provider Lens" ISG's annual evaluation of mainframe modernization service providers and platforms, including Micro Focus, Heirloom, NTT DATA, and others. Provides vendor comparison data beyond what this chapter covers. Access: ISG website (some reports publicly available)

Case Studies

Commonwealth Bank of Australia (CBA) Mainframe Modernization CBA's well-documented mainframe modernization program — one of the largest in financial services. Published analyses cover both the successes and the challenges. Relevant comparison to the banking scenarios in this chapter. Available at: Multiple published analyses; search CBA annual reports and technology conference presentations.

US Department of Homeland Security Legacy Modernization GAO reports on DHS's legacy system modernization efforts, including mainframe-to-cloud migration for immigration and customs systems. Provides government-sector context comparable to the FBA scenarios. Available at: GAO.gov — search "DHS legacy modernization"

Queensland Health Payroll System The $1.25 billion Queensland Health payroll system replacement failure — referenced in Chapter 32. Additional analysis available from the Queensland Auditor-General's reports. Relevant as a cautionary tale for Case Study 1's themes. Available at: Queensland Audit Office publications

Tier 5: Books and Technical References

Cloud Migration Strategy

"Mainframe to Cloud Migration: A Strategic Guide" by Phil Hartley and Skyla Loomis Practical guide covering assessment methodology, platform selection, data migration, and operational readiness for mainframe-to-cloud programs. Includes TCO calculation templates.

"Cloud Strategy: A Decision-based Approach to Successful Cloud Migration" by Gregor Hohpe Cloud migration decision frameworks from a former Google Cloud architect. While not mainframe-specific, Hohpe's frameworks for evaluating cloud readiness and calculating migration ROI are directly applicable to the decisions in Section 34.7.

"Monolith to Microservices" by Sam Newman Referenced in Chapter 32. The strangler fig, branch by abstraction, and parallel run patterns discussed in Newman's book directly inform the hybrid architecture patterns in Section 34.5.

Mainframe Architecture (for Understanding What You're Migrating From)

"ABCs of z/OS System Programming" (IBM Redbooks) Multi-volume IBM Redbook series covering z/OS system programming. Volume 1 covers the I/O subsystem and DASD configuration that Section 34.1 identifies as the key architectural difference between z/OS and cloud. Volume 10 covers Parallel Sysplex. Available at: IBM Redbooks (https://www.redbooks.ibm.com/)

"CICS Transaction Server: From Start to Finish" (IBM Redbooks) Comprehensive coverage of CICS architecture and capabilities. Useful for understanding why "CICS emulation" is a partial solution — the full CICS capability set described in this Redbook helps identify what Section 34.4 calls the "5% gap." Available at: IBM Redbooks

Tier 6: Online Resources and Communities

Open Mainframe Project (Linux Foundation) The mainframe open-source community. Relevant projects: Zowe (z/OS DevOps framework, used for hybrid CI/CD pipelines), COBOL Programming Course, and the Mainframe Open Education project. Available at: https://www.openmainframeproject.org/

Planet Mainframe Industry news and analysis. Regular coverage of COBOL-to-cloud migration projects, vendor announcements, and practitioner perspectives. Available at: https://planetmainframe.com/

AWS re:Post — Mainframe Modernization AWS community forum for mainframe modernization questions. Practitioners share experiences with Micro Focus on AWS, data migration patterns, and operational challenges. Available at: https://repost.aws/tags/mainframe-modernization

Azure Architecture Center — Mainframe Workloads Microsoft's reference architectures for running mainframe workloads on Azure, including COBOL rehosting patterns, data migration, and hybrid connectivity. Available at: https://learn.microsoft.com/en-us/azure/architecture/mainframe/

Chapter-Specific Cross-References