Hello, I think this is because I inserted the force config drive In nova configuration when I decided to use config drive. 
Instances created before this configuration do not have disk.config file.
Probably I must create a script with a for cycle and touch disk.config file.
Is it correct?
Ignazio

Il Mar 29 Dic 2020, 19:12 Ignazio Cassano <ignaziocassano@gmail.com> ha scritto:
Hello All, after a compute node failure if I try to reset state and hard reboot an instance it fails because disk.config file does not exist. 
I am using cinder with netapp nfs driver and I am using disk config drive.
It happens also on stein.
Any help, please ?
It can be' solved creating the disk.config with touch command but it does not seem a good solution .
Ignazio