A pop message as follows will appear:
"The selected storage type requires a vendor-supplied streamer component that is not registered or installed."
This issue can occur on a multiple (EV) server environment that host multiple Storage Services that service multiple Vault Stores. It is imperative that the EMC (ECS) streamer software is installed on the (EV) server that hosts the Storage Service that services the Vault Store that the partition is being created on.
To validate that the streamer software is being installed on the correct (EV) server perform the following:
1) Select the desired Vault Store and right click and select Properties.
2) On the General tab copy the Vault Store ID for use with a SQL Query:

3) Using the Vault Store ID from step 2 for the VaultStoreEntryID below run the following SQL Query:
Use EnterpriseVaultDirectory
Select VaultstoreEntryID,ComputerEntryID,StorageService,ComputerName,ComputerNameAlternate
From dbo.view_StorageServiceComputer_VaultStore
Where VaultStoreEntryID = '1113076930C32BB40A90B377CB55B22571210000evserver1'
4) The results of the query in step 3 will provide the ComputerName and the ComputerNameAlternate that hosts the Storage Service that services the Vault Store in question. The streamer must be installed on this particular (EV) server.
The streamer software should be obtained from the storage provider such as Dell(ECS) or Hitachi(HCP).