I turned on encryption for tape backups last week. When setting it up, I went through a couple of runs of test backups to tape before I got the setup just right. I have 1 tape that encrypted data backed up to, but the certificate wasn't quite right for what I needed, so I had to recreate the certificate after that tape was written. Now, I want to erase the data on the tape and free it up for use by a routine backup job, but the "ForceMarkTapeFree.ps1" script isn't working.
When I run the script, specifying the dpm server, library, and slot when prompted, I get the following:
The operation will remove the following recovery point(s) because they have dependencies on each other: Remove-RecoveryPoint : Length cannot be less than zero. Parameter name: length At C:\Program Files\Microsoft DPM\DPM\bin\ForceMarkTapeFree.ps1:68 char:1 + Remove-RecoveryPoint -RecoveryPoint $rp -ForceDeletion -Confirm:$false+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo : NotSpecified: (:) [Remove-RecoveryPoint], ArgumentOutOfRangeException+ FullyQualifiedErrorId : System.ArgumentOutOfRangeException,Microsoft.Internal.EnterpriseStorage.Dls.UI.Cmdlet.RecoveryCmdLets.RemoveRecoveryPoint
What can I do to get this tape cleaned up for re-use?