DELL MD3220 사용자 설명서

Planning: MD3200 Series Storage Array Terms and Concepts

Ensure that you record the LUN used to provide access to the source virtual 

disk. You need this information when you define a host server-to-virtual disk 

mapping for the target (backup) virtual disk. Also, be sure to stop all I/O 

activity to the source virtual disk before beginning the virtual disk recovery 

procedure.

You can use the Snapshot Virtual Disk and Virtual Disk Copy premium 

features together to back up data on the same storage array, or to restore the 

data on the snapshot virtual disk to its original source virtual disk.
You can copy data from a virtual disk in one of two ways:

• By taking a point-in-time snapshot of the data 
• By copying the data to another virtual disk using a virtual disk copy 

You can select a snapshot virtual disk as the source virtual disk for a virtual 

disk copy. This configuration is one of the best ways you can apply the 

snapshot virtual disk feature, since it enables complete backups without any 

impact to the storage array I/O.
You cannot use a snapshot repository virtual disk as a source virtual disk or as 

a target virtual disk in a virtual disk copy. If you select the source virtual disk 

as the target virtual disk of a virtual disk copy, you must disable all snapshot 

virtual disks associated with the source virtual disk.

Multi-path software (also referred to as the failover driver) is software resident 

on the host server that provides management of the redundant data path 

between the host server and the storage array. 
The multi-path software identifies the existence of multiple paths to a virtual 

disk and establishes a preferred path to that disk. If any component in the 

preferred path fails, the multi-path software automatically re-routes I/O 

requests to the alternate path so that the storage array continues to operate 

without interruption.

Multi-path software available on the MD3200 series resource media. 

book.book  Page 52  Monday, June 21, 2010  11:00 AM