A virtual disk can be selected as a target virtual disk for only one virtual disk copy at a time.

A virtual disk copy for any virtual disk cannot be mounted on the same host as the source virtual disk.

Windows does not allow a drive letter to be assigned to a virtual disk copy.

A virtual disk with a Failed status cannot be used as a source virtual disk or target virtual disk.

A virtual disk with a Degraded status cannot be used as a target virtual disk.

A virtual disk participating in a modification operation cannot be selected as a source virtual disk or target virtual disk. Modification operations include the following:

Capacity expansion – RAID-level migration – Segment sizing

Virtual disk expansion

Defragmenting a virtual disk

NOTE: The following host preparation sections also apply when using the virtual disk copy feature through the CLI interface.

Creating a Virtual Disk Copy

CAUTION: Possible loss of data – Source virtual disks that are participating in a virtual disk copy are available for read I/O activity only while a virtual disk copy has a status of In Progress or Pending. Write requests are allowed after the virtual disk copy has completed. If the source virtual disk has been formatted with a journaling file system, any attempt to issue a read request to the source virtual disk might be rejected by the storage array, and an error message might appear. The journaling file system driver issues a write request before it attempts to issue the read request. The storage array rejects the write request, and the read request might not be issued due to the rejected write request. This condition might result in an error message appearing, which indicates that the source virtual disk is write protected.To prevent this issue from occurring, do not attempt to access a source virtual disk that is participating in a virtual disk copy while the virtual disk copy has a status of In Progress. Also, make sure that the Read-Only attribute for the target virtual disk is disabled after the virtual disk copy has completed to prevent error messages from appearing.

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Configuration: Premium Feature—Virtual Disk Copy

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Dell MD3200, MD3220 owner manual Creating a Virtual Disk Copy, 156