Health check for proper backup ISO image

Updated: July 17, 2026

Want to summarize with AI?

This topic explains the health check feature that continuously monitors the backup ISO image stored on NCS 1004 and raises an alarm if it detects image corruption, ensuring a reliable recovery path during disaster recovery.

This feature performs a basic validation of the backup ISO image intended for use during disaster recovery.

Table 1. Feature history
Feature name	Release information	Feature description
Health check for proper backup ISO image	Release 7.5.2	This feature performs a basic validation of the backup ISO image intended for use during disaster recovery. The validation happens before copying the image to the CPU disk and motherboard disks, and thereafter the copied image is audited every 12 hours. Image corruption triggers the Disaster recovery is disabled due to corrupted ISO alarm. This health check feature ensures error-free booting of NCS 1004 during disaster recovery operations.

Note

To clear the DISASTER-RECOVERY-DISABLED alarm, log in to the Technical Support website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

Note

Verify that there is no Disaster recovery is disabled due to corrupted ISO alarm using the show alarms command before sending the CPU for RMA.

Need help?

Open a support case

(Requires a Cisco Service Contract)

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.