This topic explains key details of the disaster recovery feature on NCS 1004, which automatically restores node software and configuration with minimal downtime when you replace the CPU or chassis.
The disaster recovery feature on NCS 1004 enables you to quickly and automatically restore node software and configuration after hardware replacement, minimizing system downtime and manual intervention. The feature operates without requiring console access. Before replacing a CPU, use the graceful-recovery backup initiate command to back up the XR configuration. The node also creates a backup of the running XR configuration after 20 minutes. After rebooting, the node immediately backs up the XR configuration.
CPU replacement
Consider these points for CPU replacement:
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The node runs in headless mode.
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You can insert the CPU with SSD, and the node then starts to boot the OS from the CPU SSD.
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The system compares the versions of the images in the CPU SSD and the chassis SSD.
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If the version is different, configuration is taken from chassis SSD as the chassis golden image has priority.
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If the version is the same, the node boots up. The node performs this version comparison during every reboot, including power cycles.
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The node always uses the configuration from the chassis. If the chassis SSD is not functional, the node boots using only the CPU.
Chassis replacement
Consider these points for chassis replacement:
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Chassis replacement results in minimum downtime.
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When you receive the chassis, connect the CPU and boot the system. After receiving the empty chassis through RMA, insert the CPU to restore the configuration.
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You can also swap the CPU from other units; however, the chassis image and configuration will be replaced on the CPU.