DPM couldn't find valid recovery points for VM listed as having numerous recovery points when writing to tape

Question

I'm seeing the following events when DPM tries writing to tape:
Log Name:      DPM Alerts
Source:        DPM-EM
Date:          15/02/2014 12:01:07
Event ID:      3311
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      <backup server FQDN>
Description:
The back up to tape job failed for the following reason: (ID: 3311)
Backup of Non VSS Datasource Writer on <PROD server FQDN> cannot be completed. DPM could not find a valid recovery point on disk. (ID: 30126)
All VMs on each of the affected servers have recovery points but
When performing disk to disk to tape backups (d2D2T), tape backups will fail if a new disk based backup is not created before the next scheduled tape backup.  DPM always makes tape backups by mounting last successful disk based recovery point. 
This is so we don't need to transfer data over the network since that most recent data is already on the DPM server. Look to see why the disk recovery points are failing and correct that to prevent tape backups from failing.
http://social.technet.microsoft.com/Forums/en-US/a9b80780-2a5c-43bc-8111-ee35db56f359/backup-tapes-dpm-2012?forum=dpmtapebackuprecovery
Is this the only time that recovery points are verified? Can I do a manual verification of recovery points? I'm concerned that some of the backups I have may be corrupt. If that's the case I need a way of finding out which ones are affected and a way to
resolve the issue. Unfortunately I've not found much,the DPM error code isn't even listed in the official documentation. http://technet.microsoft.com/en-us/library/hh859159.aspx Other threads where people have seen this issue seem to be for older versions
of DPM (I'm using the latest 2012 R2 fully updated).

Answer 1

Hi,
I've been having some difficulty running the Powershell command, see below. I've been using this for guidance http://technet.microsoft.com/en-us/library/hh881586%28v=sc.20%29.aspx where am I going wrong here?
$Pg = Get-DPMProtectionGroup
-DPMServerName <dpm server name here>
$Ds = Get-DPMDatasource
-ProtectionGroup $Pg[1]
New-DPMRecoveryPoint
-Datasource $Ds
-Disk -DiskRecoveryPointOption -WithDataIntegrityCheck
PS C:\Program Files\Microsoft System Center 2012 R2\DPM\DPM\bin> New-DPMRecovery
Point -Datasource $Ds -Disk -DiskRecoveryPointOption -WithDataIntegrityCheck
New-DPMRecoveryPoint : Missing an argument for parameter
'DiskRecoveryPointOption'. Specify a parameter of type 'Microsoft.Internal.Ente
rpriseStorage.Dls.EngineUICommon.EngineConstants.DbEnums+CreateDiskRecoveryPoin
tOption' and try again.
At line:1 char:44
+ New-DPMRecoveryPoint -Datasource $Ds -Disk -DiskRecoveryPointOption
-WithDataInt ...
+                                           
~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo         
: InvalidArgument: (:) [New-DPMRecoveryPoint], Par
   ameterBindingException
    + FullyQualifiedErrorId : MissingArgument,Microsoft.Internal.EnterpriseSto
   rage.Dls.UI.Cmdlet.ProtectionCmdLets.CreateRecoveryPoint
PS C:\Program Files\Microsoft System Center 2012 R2\DPM\DPM\bin>