DR Drill: проверка процедур восстановления и команды
Companies regularly invest in backup and fault-tolerant infrastructure but often fail to verify whether it will work during a real failure. The first disaster recovery drill (DR Drill) usually reveals unpleasant surprises: a database backup takes 6 hours to restore instead of the planned 30 minutes, and the runbook contains commands for a server that has long been decommissioned. Such issues go unnoticed until an incident, when every minute of downtime costs tens of thousands of dollars. For example, in e-commerce, downtime during peak loads can lead to millions of rubles in lost revenue per hour. During a peak season failure, losses can exceed $100,000 per hour. We conduct comprehensive DR drills to identify weaknesses in team procedures before they lead to a catastrophe. With over 7 years of experience and more than 50 completed drills, we guarantee the detection of critical issues.
What problems does the first DR Drill uncover?
Unverified backups are an illusion of security. During the first drill, we often find:
- Backup exists, but restoration takes 6 hours instead of the expected 30 minutes
- Configuration files are stored only on the primary server and are not included in backups
- Secrets (API keys, certificates) are kept in people's heads rather than in a Vault/Secrets Manager
- The runbook describes outdated infrastructure
- The team does not know who makes the decision to activate DR
These problems directly affect RTO and RPO. According to a Disaster Recovery Journal survey, 53% of organizations fail to meet their stated RTO during actual recovery. Regular drills are the only way to verify whether your procedures match your promises. Drills save an average of $50,000 by identifying issues before an incident.
Why are regular drills critical?
Drills allow you to test not only the technical side but also communication processes. In a stressful situation, the team acts differently than on paper. Regular drills turn recovery into routine rather than a fire drill. They also help justify infrastructure budgets: after drills, you know exactly which components need reinforcement. For example, one client discovered that promoting a PostgreSQL replica took 4 times longer than the RTO — after the drill, we optimized the configuration and reduced it to 2 minutes. The savings from preventing a single incident can be up to $200,000.
How we prepare and conduct a DR Drill?
Our approach starts with an audit of the current infrastructure and documentation. We update the runbook, check backups, and assign roles. Then we select a scenario (see table below) and conduct the drill in an agreed-upon window. After the drill, we record actual metrics and create an improvement plan.
| Scenario | What we test | Typical time |
|---|---|---|
| Primary DB failure, promote replica | Promotion time, application correctness | 5-15 min |
| Primary server loss | DNS failover, switchover time | 10-30 min |
| Data corruption (accidental delete) | PITR recovery, RPO | 30-60 min |
| Complete region/DC loss | IaC boot + data from DR Site | 2-8 hours |
| Secret compromise | Rotate all credentials, time | 1-2 hours |
Case study: recovery after primary DB failure
In one project, we conducted a functional exercise for promoting a PostgreSQL replica. Initially, the RTO was 15 minutes, but actual recovery took 45 minutes due to manual DNS updates. After the drill, we automated the switchover using an Ansible script and reduced the RTO to 3 minutes.Comparison of drill types
| Drill type | What it tests | Duration | Production risk |
|---|---|---|---|
| Tabletop exercise | Action plan, roles, communications | 2-4 hours | None |
| Functional exercise | Individual components (backup, failover) | 4-8 hours | Minimal |
| Full-scale drill | Full scenario with DR site boot | 1-2 days | Moderate (requires window) |
Tabletop exercises are good for initial checks — they take only half a day and do not touch production. Functional exercises uncover issues with specific tools, such as errors in backup scripts. Full-scale drills are the most realistic but require careful preparation. In our practice, full-scale drills are 3 times more effective than tabletop exercises for testing communications.
How to conduct a successful DR Drill?
- Update the runbook. Verify that all commands and server addresses match the current infrastructure.
- Check backup freshness. Ensure the latest backup is complete and available for restoration.
- Assign roles. Determine who makes decisions, who executes steps, and who records timestamps.
- Choose a scenario. Start with tabletop, then progress to functional, and only then to full-scale.
- Conduct a post-mortem. Compare actual metrics with expected RTO/RPO and create an improvement plan.
What is included in the work
We provide turnkey:
- Updated runbook with step-by-step instructions
- Drill report with time metrics and deviations
- Updated procedures and improvement recommendations
- Team training and documentation handover
According to the NIST SP 800-34 methodology (https://www.nist.gov/privacy-framework/nist-sp-800-34), regular drills are a mandatory part of a business continuity program.
Typical mistakes in organizing DR
- Conducting drills without a preliminary tabletop — jumping straight to full-scale without knowing if the runbook works.
- Not assigning an observer — without recording time, it's impossible to estimate RTO.
- Ignoring post-mortem — drills without analysis are just wasted time.
- Thinking one full-scale drill per year is enough — infrastructure changes in between, and functional exercises help stay in shape.
If you want to test your resilience to failures, contact us for a consultation. Preparation for the first tabletop exercise takes 2-3 days, organizing a functional exercise takes 3-5 days, and a full-scale drill takes 1-2 weeks. The cost is calculated individually based on infrastructure complexity and the chosen scenario. To get a consultation and estimate timelines for your project, contact us. To order a DR Drill, contact us and receive a professional analysis of your infrastructure.