Dell MD3600I, MD3620I Before you Begin, Virtual Disk Copy and Modification Operations, 173

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.

The Virtual Disk Copy premium feature includes these items:

•The Create Copy Wizard, which assists in creating a virtual disk copy

•The Copy Manager, which monitors virtual disk copies after they have been created

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.

Configuration: Premium Feature—Virtual Disk Copy

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