IBM Flex System V7000 Storage Node 4939H49 User Manual

Chapter 9. IBM Flex System V7000 Storage Node Copy Services 

Draft Document for Review January 29, 2013 12:52 pm

2. Create a FlashCopy mapping for the backup to be restored with the target volume being 

the source volume and the original source production as the target volume, if this mapping 
does not already exist.

3. Start the FlashCopy map (Target Data -> Customer Data) with the 

option to 

copy the backup data onto the production disk. 

The production disk is instantly available with the backup data.

Regardless of whether the initial FlashCopy map (Customer Data to Target Data) is 
incremental, the Reverse FlashCopy operation only copies the modified data.

Consistency groups are reversed by creating a set of new “reverse” FlashCopy maps and 
adding them to a new “reverse” consistency group. Consistency groups cannot contain more 
than one FlashCopy map with the same target volume.

There are several items that must be considered before performing a FlashCopy, which we 
describe in this section.

Consider the following guidelines for FlashCopy implementation:

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The source and target volumes must be on the same IBM Storwize V7000 
storage system.

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The source and target volumes do not need to be in the same storage pool.

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The FlashCopy source and target volumes can be thin-provisioned. 

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The source and target volumes must be the same size. The size of the source and target 
volumes cannot be altered (increased or decreased) while a FlashCopy mapping 
is defined. 

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FlashCopy operations perform in direct proportion to the performance of the source and 
target disks. If you have a fast source disk and slow target disk, the performance of the 
source disk is reduced because it must wait for the write operation to occur at the target 
before it can write to the source.

Table 9-2 shows some of the FlashCopy maximum configurations.

The -restore option: In the GUI, the 

 option is applied automatically when you 

start the FlashCopy mapping from Target Data to Customer Data; when using the CLI, 
you need to add the 

 option to the command manually. 

FlashCopy targets per source

256

FlashCopy mappings per cluster

4,096

FlashCopy consistency groups per 
cluster

127