Introduction to Disaster Recovery and Its Importance
Disaster Recovery (DR) in a SIEM solution refers to the processes and infrastructure put in place to ensure that security monitoring, log collection, and incident analysis can continue, or be quickly restored, after an unexpected disruption such as a system failure, cyberattack, or natural disaster. A well-designed DR strategy typically includes data replication, backup SIEM instances, failover mechanisms, and clearly defined recovery time and recovery point objectives. Its importance lies in maintaining continuous visibility into security events during critical moments, preserving forensic data for investigations and compliance, and minimizing downtime that could leave an organization blind to active threats.
Implementing Logsign for Disaster Recovery Operations
To ensure business continuity and data availability, an additional Logsign server is deployed at the Disaster Recovery (DR) site as part of the overall architecture. This DR server is designed to act as a fallback system in the event of a failure at the primary site.
Archived data and signed data from the primary environment are forwarded to the DR site once a day with the built-in Data Transfer Tools feature (Settings > Data Management > Data Transfer Tools). On the primary server, create a tool of type Rsync or FTP that points to the DR server, select the Run Time, and enable Save Archive and Save Signed Logs (and Save Config Backup if you also want to carry the configuration backups). Each active tool runs once a day after its Run Time, so the DR site consistently maintains up-to-date copies of critical data, reducing the risk of data loss and enabling recovery when required. For field details, see the Data Transfer Tools User Guide.
In a worst-case scenario where all servers in the primary site become unavailable, the DR site will still retain data from the previous day. This data already includes the necessary archived and signed logs, allowing the organization to maintain access to historical logs and evidence. While the failover process requires manual intervention, it is designed to ensure continuity of operations with minimal downtime and allows data to be retrieved as needed for investigation, compliance, or reporting purposes.
More specifically, indexes from the previous day are stored on the Logsign Server at the DR site as cold data within the archive. If there is a requirement to make this archived data searchable or usable as active indexes, the data can be restored with the Offline Report feature (Reports > Offline Reports > New Offline Report). This feature rewrites cold archived data back into index format on the DR site, ensuring that historical data remains accessible and can be effectively utilized. If the transferred archive files are kept in a directory other than the standard archive directory, enter that directory in the Custom Path (Optional) field of the offline report form. For details, see the Offline Report article.
In summary, under this DR architecture, the only potential data loss is limited to the current day’s index. All prior data remains preserved at the DR site, providing a reliable and controlled recovery mechanism in the event of a primary site failure.
DR Activation Steps and Switchover Method
Consider a situation that in the current setup, there is an active and fully operational server running at the primary Data Center (DC). As part of the Disaster Recovery (DR) implementation, a new server is deployed and prepared to function as the DR instance. All required system resources, configurations, and settings from the primary server (including indexed, archived, signed data, configurations, rules, dashboards, and users) are exported and then imported into the DR server to ensure configuration consistency between both environments.
Additional licensing is allocated to the DR server to enable it to operate independently when required. Licensing requirements and implications should be reviewed and confirmed in advance with the Logsign Sales Team to ensure compliance and readiness during a switchover scenario.
Once the DR server is fully configured, it remains in a passive state. While it is not actively processing data, all relevant resources remain attached and intact, allowing for a controlled and predictable transition if needed. To keep the DR environment up to date, archive data is synchronized every day from the primary server to the DR server with a Data Transfer Tools definition of type Rsync or FTP. This regular data transfer ensures that the DR server maintains recent archived data and can be activated with minimal data loss and downtime in the event of a disaster or planned switchover.
Prerequisites and Best Practices
Before implementing or activating the Disaster Recovery (DR) solution, certain prerequisites must be met to ensure a smooth and reliable recovery process. The DR server must be fully provisioned with compatible hardware, operating system, and storage capacity to match the primary environment. All configurations, resources, and integrations should be exported from the primary system and successfully imported into the DR server. Appropriate licensing must be assigned in advance and validated with the Sales Team to avoid delays during activation. Additionally, secure network connectivity between the primary site and the DR site must be established so that the Data Transfer Tools definition can reach the DR server (by default port 22 for Rsync and port 21 for FTP). Use the Test Connection button in the tool form to confirm the connection before saving.
Best practices include regularly validating data synchronization jobs, checking the status of each tool on the Data Transfer Tools page, and performing periodic test recoveries to confirm that archived and signed data can be restored and accessed correctly at the DR site. Configuration changes made in the primary environment should be promptly replicated to the DR server to avoid drift. You can back up the configuration under Settings > Data Management > Backup Management; see the Backup Management User Guide.
It is also recommended to document and rehearse the manual intervention steps required for DR activation so that operational teams can execute the switchover efficiently during an actual incident.
Recovery Timelines and Potential Data Gaps
Recovery timelines depend largely on the nature of the incident and the readiness of the DR environment. In a full primary cluster failure scenario, the DR server can be brought online once manual activation steps are completed and licensing is validated. Since archive and signed data are synchronized on a daily basis, historical data up to the previous day is already available at the DR site. If required, this data can be restored from cold archive into searchable indexes using the Offline Report feature, which may add additional time depending on data volume and system performance.
The primary potential data gap is limited to the current day’s index, as this data may not yet have been archived or transferred at the time of failure. No other historical data loss is expected, provided that the daily data transfer has been running successfully.