Dell PowerVault MD3820f - Manual (Page 189)

Before You Begin
A virtual disk copy fails all snapshot virtual disks that are associated with the target virtual disk, if any exist.
If you select a source virtual disk of a snapshot virtual disk, you must disable all of the snapshot virtual
disks that are associated with the source virtual disk before you can select it as a target virtual disk.
Otherwise, the source virtual disk cannot be used as a target virtual disk.
A virtual disk copy overwrites data on the target virtual disk and automatically makes the target virtual disk
read-only to hosts.
If eight virtual disk copies with a status of In Progress exist, any subsequent virtual disk copy has a status
of Pending, which stays until one of the eight virtual disk copies completes.
Virtual Disk Copy And Modification Operations
If a modification operation is running on a source virtual disk or a target virtual disk, and the virtual disk
copy has a status of In Progress, Pending, or Failed, the virtual disk copy does not take place. If a
modification operation is running on a source virtual disk or a target virtual disk after a virtual disk copy
has been created, the modification operation must complete before the virtual disk copy can start. If a
virtual disk copy has a status of In Progress, any modification operation does not take place.
Create Copy Wizard
The Create Copy Wizard guides you through:
• Selecting a source virtual disk from a list of available virtual disks
• Selecting a target virtual disk from a list of available virtual disks
• Setting the copy priority for the virtual disk copy
When you have completed the wizard dialogs, the virtual disk copy starts, and data is read from the
source virtual disk and written to the target virtual disk.
Operation in Progress icons are displayed on the source virtual disk and the target virtual disk while the
virtual disk copy has a status of In Progress or Pending.
Failed Virtual Disk Copy
A virtual disk copy can fail due to these conditions:
• A read error from the source virtual disk
• A write error to the target virtual disk
• A failure in the storage array that affects the source virtual disk or the target virtual disk
When the virtual disk copy fails, a critical event is logged in the Event Log, and a Needs Attention icon is
displayed in the AMW. While a virtual disk copy has this status, the host has read-only access to the
source virtual disk. Read requests from and write requests to the target virtual disk do not take place until
the failure is corrected by using the Recovery Guru.
Preferred RAID Controller Module Ownership
During a virtual disk copy, the same RAID controller module must own both the source virtual disk and
the target virtual disk. If both virtual disks do not have the same preferred RAID controller module when
the virtual disk copy starts, the ownership of the target virtual disk is automatically transferred to the
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