Dell PowerVault MD3000 - Manual (Page 65)

Disk Groups and Virtual Disks
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Volume Shadow-Copy Service
The Microsoft Volume Shadow-copy Service (VSS) is a storage management
interface for Microsoft Windows operating systems. VSS enables your storage
array to interact with third-party applications that use the VSS Application
Programming Interface.
Virtual disks that will be used as source virtual disks for VSS snapshots should
have names no longer than 16 characters. The VSS hardware provider uses the
source virtual disk name as a prefix for the snapshot and repository virtual
disk names. The resulting snapshot and repository names will be too long if
the source virtual disk name exceeds 16 characters.
For more information on VDS and VSS, see www.microsoft.com.