Dell POWERVAULT MD3620I Owner's Manual page 187

A virtual disk copy automatically makes the target virtual disk read-only to
hosts. You may want to keep this attribute enabled to preserve the data on the
target virtual disk.
CAUTION:
If you decide not to preserve the data on the target virtual disk after the
virtual disk copy has completed, disable the Read-Only attribute for the target
virtual disk. For more information on enabling and disabling the Read-Only
attribute for the target virtual disk, see "Virtual Disk Read/Write Permissions" on
page 182.
To prevent write-protected error messages from being displayed, do not try 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 being displayed.
To copy the virtual disk:
1 Stop all I/O activity to the source virtual disk and the target virtual disk.
2 Unmount any file systems on the source virtual disk and the target virtual
disk.
3 In the AMW, select the Logical tab and select the source virtual disk.
4 Select Virtual Disk Create Copy.
The Select Source Virtual Disk and Copy Type window is displayed.
5 In the Select source virtual disk area, select the appropriate virtual disk.
6 In the Select Copy Type area, select either Offline or Online Copy Type.
NOTE:
An online virtual disk copy overwrites data on the target virtual disk and
automatically makes the target virtual disk read-only to hosts. After the online
virtual disk copy completes, use Copy Manager to disable the Read-Only
attribute for the target virtual disk. If you have used the target virtual disk in a
virtual disk copy before, make sure that you no longer need that data or have
backed it up in an accessible location.
The Select Target Virtual Disk window is displayed.
7 In the Select target virtual disk area, select the appropriate virtual disk
8 In the Select copy priority area, select the relevant copy priority and click
Next.
The Confirmation window displays the summary of your selections.
Configuration: Premium Feature—Virtual Disk Copy
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