StartSnapshotSet to create a new, empty shadow copy set. A volume is a critical volume if it contains system state information.
However, they are not re-created or reformatted if they meet the following conditions: The number of volumes that are available in the physical pack during restore must be greater than or equal to the number of volumes that were specified in the ASR writer metadata during backup.
The requester must include all volumes that contain system-critical components reported by writers, such as the volumes that contain the Active Directory.
SetContext to set the context for the shadow copy operation. The ASR writer supports the following options: System-critical components are marked as vss writer service selectable for backup.
ASR will re-create the volumes exactly the way they were at the time of the backup and set the RestoreSession registry key. PreRestore to notify the ASR writer to prepare for a restore operation. A basic disk is not re-created if its disk layout is intact or only additive changes have been made to it.
After WinPE disaster recovery has completed, the computer has restarted, and the Windows operating system is running normally, the VSS service can be started, and the requester can perform any additional restore operations that require participation of writers other than the ASR writer.
Otherwise, it is not selectable. If during the restore session the backup application detects that one or more volumes are changed or missing, the backup application should use ASR to perform the restore.
The following example shows how to use SetRestoreOptions to prevent disk 0 and disk 1 from being re-created and inject third-party drivers into the restored boot volume.
If during the restore session the backup application detects that the volume unique IDs are unchanged, and therefore all volumes from the time of the backup are present and intact in WinPE, the backup application can proceed to restore only the contents of the volumes, without involving ASR.
Overview of Backup Phase Tasks At backup time, the requester performs the following steps. This entry should be in the following format: AddComponent for each of them. The system partition path can be found under the following registry key: Those disks should be restored online after the operating system is restored in the Windows RE.IF you are getting volume shadow copy service (VSS) error Unexpected error DeviceIoControl and on windows or windows server R2, then you hit the limit.
A VSS backup-and-recovery application that performs disaster recovery (also called bare-metal recovery) can use the Automated System Recovery (ASR) writer together with Windows Preinstallation Environment (Windows PE) to back up and restore critical volumes and other components of the bootable system state.
The backup application is implemented as a VSS .Download