IBM i Disaster Recovery: Options, RPO/RTO & Testing
How should disaster recovery be designed for IBM i?
Start with business-service RPO and RTO targets, then map every IBM i dependency required to meet them: Db2 for i, IFS data, libraries and objects, authorities, queues, schedules, integrations, certificates, network services, third-party software, and people. Choose backup, replication, high availability, or hosted DR based on those targets, and prove the design through restore, failover, application validation, and failback tests.
Start with the business
Set RPO and RTO by recoverable service
Recovery Point Objective (RPO) defines acceptable data loss. Recovery Time Objective (RTO) defines acceptable service interruption. Set both for each business service before selecting technology.
Best fit
Tier services, not just LPARs
One partition can host services with different recovery priorities. Map applications, data, interfaces, users, schedules, and validation steps to each service tier.
Best fit
Price the target, not the slogan
A tighter RPO or RTO requires more current data, ready capacity, automation, network readiness, operational coverage, and testing.
Use caution
Do not confuse replication with recovery
Replication can copy corruption, bad changes, or ransomware impact. Keep protected backups and separate recovery paths alongside replicated systems.
Use caution
Include failback
A successful failover is only half the plan. Document how data and services return to the preferred production environment after the event.
Recovery models
IBM i disaster recovery options compared
| Option | Best fit | Data currency | Activation model | Main limitation |
|---|---|---|---|---|
| Backup and restore | Services with relaxed recovery objectives | Limited by the latest valid backup | Restore IBM i, data, objects, configuration, and applications | Longer recovery and more manual reconstruction |
| Replicated standby | Services needing tighter data-loss and recovery targets | Depends on replication design and health | Activate the standby and complete application and network steps | Replication alone does not prove application recoverability |
| High-availability pair | Critical services requiring rapid, repeatable failover | Near-current when the solution remains healthy | Orchestrated or automated role change | Higher cost, operational discipline, and configuration complexity |
| Hosted DR or DRaaS | Teams needing off-site capacity and provider assistance | Varies by replication and service tier | Customer, provider, or shared runbook | Service boundaries, capacity, test rights, and contract terms vary |
Recovery scope
What an IBM i recovery plan must protect
A recoverable database is not automatically a recoverable business service. Include the platform and application dependencies around it.
Db2 for i and journals
Database libraries, journals, receivers, commitment control, replication health, and consistency checks.
IFS and system objects
IFS data, libraries, user profiles, authorities, device descriptions, data areas, queues, and configuration objects.
Applications and integrations
ERP or line-of-business applications, interfaces, middleware, file transfers, APIs, certificates, and external endpoints.
Batch and operations
Job schedules, subsystems, output queues, operational calendars, monitoring, alerting, and restart sequences.
Network and identity
DNS, routes, VPNs, firewall rules, authentication, privileged access, and user communication.
People and evidence
Named decision makers, on-call contacts, vendor escalation, validation owners, communications, and retained test evidence.
How to test IBM i disaster recovery
- Verify protected data. Confirm backup success, replication health, retention, encryption, access, and a usable recovery point.
- Activate the target. Provision or start the recovery partition, storage, network, and supporting services using the documented runbook.
- Validate IBM i. Check system values, authorities, subsystems, libraries, IFS, queues, schedules, monitoring, and operational access.
- Validate applications. Run business transactions, integrations, reports, batch jobs, and reconciliation checks with application owners.
- Measure the result. Record achieved RPO and RTO, manual steps, defects, owner, evidence, and remediation due dates.
- Prove failback. Test how changed data, network routes, and user access return to the preferred production environment.
Questions to ask IBM i DR and hosting providers
- Which IBM i levels, Power targets, replication products, backup formats, and network patterns are supported?
- Is standby capacity reserved, shared, or provisioned only after a declaration?
- Which RPO, RTO, response, and activation commitments are contractual, and what exclusions apply?
- Who declares a disaster, starts failover, changes networks, validates applications, communicates status, and approves failback?
- How often can technical and business tests be run, what do they cost, and what evidence is provided?
- How are backups isolated from production credentials and replicated failure, corruption, or ransomware impact?
IBM i disaster recovery: frequently asked questions
What is IBM i disaster recovery?
IBM i disaster recovery is the combination of protected data, standby infrastructure, network and application recovery procedures, people, and testing used to restore IBM i business services after an outage or site-level event.
What is the difference between IBM i backup, high availability, and disaster recovery?
Backup preserves recoverable copies of data and objects. High availability reduces interruption by keeping a synchronized alternate system or partition ready for failover. Disaster recovery covers the broader ability to restore business services after a major event, including infrastructure, applications, network, people, communications, and failback.
Do AS/400 and iSeries systems need a different DR plan?
AS/400 and iSeries are older names still used for IBM i environments. Recovery design should be based on the actual IBM i release, Power hardware or cloud target, application dependencies, data-protection method, licensing, and business recovery objectives rather than the legacy name alone.
How often should IBM i disaster recovery be tested?
The cadence should match business risk, regulatory requirements, and the rate of change in the environment. A useful program combines regular restore checks, tabletop exercises, technical failover tests, and periodic end-to-end business validation instead of relying on one annual event.
Can IBM Power Virtual Server be used as an IBM i DR target?
Power Virtual Server can be evaluated as a target for IBM i recovery architectures, but suitability depends on region, supported IBM i level, capacity, replication method, connectivity, security, licensing, and the operational steps needed to activate and validate applications. Confirm current capabilities with IBM and the replication provider.
Need an IBM i Recovery Gap Review?
Map recovery objectives, dependencies, provider responsibilities, and test evidence before the next outage or contract renewal exposes the gaps.