Dell EMC PowerVault MD Series Administrator's Manual page 172

• The number of snapshot virtual disks that can be created using a single snapshot set varies with the I/O load on the RAID controller
modules. Under little or no I/O load, the number of virtual disks in a snapshot set must be limited to eight. Under high I/O loads, the
limit must be three.
• The snapshot virtual disks created in the MD Storage Manager are differential snapshots. Plex snapshots are not supported.
• Virtual disks to be used as source virtual disks for VSS snapshots must not have names longer than 16 characters. The VSS hardware
provider uses the base virtual disk name as a prefix for the snapshot and repository virtual disk names. The resulting snapshot and
repository names are too long if the source virtual disk name exceeds 16 characters.
NOTE: A volume is another term for virtual disk.
For more information about VDS and VSS, see Microsoft.com.
172 System interfaces