If the disaster recovery topology contains any compute instances, use the following steps to prepare each compute instance for Full Stack DR:

1. Create a block storage volume group in the same Availability Domain (AD) as the compute instance.
2. Add the boot volume for the compute instance to the volume group created in Step 1.
3. Add all block volumes attached to the compute instance to the volume group created in Step 1.
4. If the DR workflow requires execution of user-defined (custom) scripts or commands on compute instances, set up IAM policies so you can run these commands using the Oracle Cloud Agent. Configure sudo access for a root administrator on these instances if you want to invoke the scripts or commands with a different user ID.
   Note
   
   If a command requires administrator permissions, you must grant administrator permissions to the Compute Instance Run Command plugin to be able to run the command. See Running Commands with Administrator Privileges.