DELL MD3220 사용자 설명서

Planning: MD3200 Series Storage Array Terms and Concepts

Virtual disk copy is a premium feature you can use to:

• Back  up  data
• Copy data from disk groups that use smaller-capacity physical disks to disk 

groups using greater capacity physical disks

• Restore snapshot virtual disk data to the source virtual disk. 

Virtual disk copy generates a full copy of data from the source virtual disk to 

the target virtual disk in a storage array.

When you create a virtual disk copy, a copy pair consisting of a source virtual 

disk and a target virtual disk is created on the same storage array. When a 

virtual disk copy is started, data from the source virtual disk is copied 

completely to the target virtual disk.

When you start a virtual disk copy, the target virtual disk maintains a copy of 

the data from the source virtual disk. You can choose whether to use an 

existing virtual disk or create a new virtual disk as the target virtual disk. If 

you choose an existing virtual disk as the target, all data on the target is 

overwritten. A target virtual disk can be a standard virtual disk or the source 

virtual disk of a failed or disabled snapshot virtual disk.

The target virtual disk capacity must be equal to or greater than the source 

virtual disk capacity.

When you begin the disk copy process, you must define the rate at which the 

copy is completed. Giving the copy process top priority slightly impacts I/O 

performance, while giving it lowest priority makes the copy process longer to 

complete. You can modify the copy priority while the disk copy is in progress.
For more information, see the online help topics.

You can use the Edit host server-to-virtual disk mappings feature to recover 

data from the backup virtual disk. This functionality enables you to unmap 

the original source virtual disk from its host server, then map the backup 

virtual disk to the same host server.

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