Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are ...

Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are unable to locate the volumes in Disk Management then try following -
1)Rescan from DPM Disk Management tab and check if volume is back online.
2) use the Protection task area in DPM Administrator Console to stop protection of the data source using the Delete replica option, and then add the data source to a protection group again.

Verify that the computer is joined to a domain, that DNS is correctly configured, and that you are logged on as a domain ... Verify that the computer running DPM has DCOM launch and access permissions for %ServerName;, and that the system time on ... Verify that the credentials you provided have administrator privileges on %ServerName; and then try to reinstall the protection ... Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are ... Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are ... Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are ... Verify that the disk containing the replica volume and the recovery point volume is shown in Disk Management. If you are ... Verify that the disk containing the replica volume is shown in Disk Management. Or, in the Protection task area in DPM Administrator ... Verify that the DPM server has DCOM launch and access permissions for %ServerName; and that the system time on the DPM server ...