Configuration: Premium Feature—Snapshot Virtual Disks 151Preparing Host Servers to Create the Snapshot Using the Advanced PathNOTE: Before using the Snapshot Virtual Disks Premium Feature in a Microsoft®Windows® clustered configuration, you must first map the snapshot virtual disk tothe cluster node that owns the source virtual disk. This ensures that the clusternodes correctly recognize the snapshot virtual disk.NOTE: Mapping the snapshot virtual disk to the node that does not own the sourcevirtual disk before the Snapshot enabling process is completed can result in theoperating system mis-identifying the snapshot virtual disk. This, in turn, can result indata loss on the source virtual disk or an inaccessible snapshot.NOTE: For details on mapping the snapshot virtual disk to the secondary node,refer to the Dell™ PowerVault™ MD3200i and MD3220i Storage Arrays WithMicrosoft® Windows Server® Failover Clusters on support.dell.com/manuals.The destination of a snapshot repository virtual disk is determined based onthe free capacity available in the disk group. A snapshot repository virtual diskrequires a minimum 8 MB of free capacity. You can choose your preferredcreation path—simple or advanced—if the disk group of the source virtualdisk has the required amount of free space.If 8 MB of free capacity is not available in the disk group of the source virtualdisk, the Create Snapshot Virtual Disks feature defaults to the advanced path(see "Creating a Snapshot Virtual Disk Using the Advanced Path" onpage 149). In the advanced path option, you can choose to place the snapshotrepository virtual disk in another disk group or you can use unconfiguredcapacity on the storage array to create a new disk group.NOTE: You can create concurrent snapshots of a source virtual disk on both thesource disk group and on another disk group.Before creating a Snapshot Virtual Disk:• The following types of virtual disks are not valid source virtual disks:snapshot repository virtual disks, snapshot virtual disks, target virtual disksthat are participating in a virtual disk copy.NOTE: Virtual Disk Copy is an Advanced (Premium) feature.• You cannot create a snapshot of a virtual disk that contains unreadablesectors.
