In vCloud 5.1 it is very difficult to move media from LUN to LUN once it is uploaded. In vCloud 5.5 this gets better but it is still a pain.
One method I have found that works is to disable the LUN you want the media moved off of, and change something on the media record. Something such as adding a ' ' (space) to the description will cause vCloud Director to copy the media to a new LUN.
Below is a script to mass update media entries to allow them to move easier.
1$MediaToUpdate = Get-Catalog -Org NAME | Get-Media
2Foreach ( $Media in $MediaToUpdate ) {
3 $RefMedia = Get-Media -Id $Media.Id
4 Write-Host "Updating " $RefMedia.Name
5 $OldDescription = $RefMedia.Description
6 $OldDescription += "."
7 $Media.ExtensionData.Description = $OldDescription
8 $Media.ExtensionData.UpdateServerData
9}
Just make sure the LUN you want cleaned off is ‘disabled’ and you have enough space on the other LUNs for the newly copied/moved media.