Devices disappear after upgrading DCE to version 7.9.0

[EcoStruxureIT]

Some customers have reported that devices disappear after upgrading DCE to version 7.9.0. A file system issue was discovered in DCE 7.9.0 that was addressed in DCE 7.9.2.

If you are experiencing this issue, it is recommended that you restore the system using the last working backup taken before the issue occurred, and then upgrade your DCE server to version 7.9.2 (or newer when available). 

If you do not have a DCE 7.8.1, 7.9.0, or 7.9.1 backup, you must start with a fresh install to resolve this issue, preferably DCE 7.9.2 (or newer when available).