IBM DS8000 manual Interfaces for Copy Services, Storage Hardware Management Console S-HMC

LSS11

1st

Completed

This write operation is completed because LSS11 is not in an extended long busy condition.

Servers

2nd

3rd

independent for each write operation

LSS12

Wait

LSS13

Completed

This write operation is not completed because LSS12 is in an extended long busy condition.

This write operation is completed because LSS13 is not in an extended long busy condition.

(I/O sequence is not kept.)

Figure 7-15 Consistency Group: Example.3

In this case, the copy created by the Consistency Group operation reflects only the 1st and 3rd write operation, not including the 2nd operation.

If you accept this result, you can use the Consistency Group operation with your applications. But, if you cannot accept it, you should consider other procedures without Consistency Group operation. For example, you could stop your applications for a slight interval for the backup operations.

7.3 Interfaces for Copy Services

There are multiple interfaces for invoking Copy Services. We describe them in this section.

7.3.1 Storage Hardware Management Console (S-HMC)

Copy Services functions can be initiated over the following interfaces:

￿zSeries Host I/O Interface

￿DS Storage Manager web-based Interface

￿DS Command-Line Interface (DS CLI)

￿DS open application programming interface (DS Open API)

DS Storage Manager, DS CLI, and DS Open API commands are issued via the Ethernet network, and these commands are invoked by the Storage Hardware Management Console (S-HMC). When the S-HMC has the command requests, including those for Copy Services,

136DS8000 Series: Concepts and Architecture