The deletion strategy is set to 'Mark as absent' for related Disk Cls discovered via...

The deletion strategy ‘Mark as absent’ means that when a related CI that was previously discovered by a pattern is no longer found, the install_status attribute of that CI is set to Absent. This indicates that the CI is missing or removed from the network. The main CI (in this case, the Linux Server CI) is not affected by the deletion strategy of the related CI (in this case, the Disk CI)12.

References

1: Set a deletion strategy - Product Documentation: San Diego - ServiceNow

2: Network adapter status setting to “Absent” in EMC … - ServiceNow …