Initial copy priority option and scheduling order

When you create more pairs than the maximum initial copy activities , you can control the order in which the initial copy operations are performed using the Initial Copy Priority option.

The following two examples illustrate how to use the Initial Copy Priority option.

Example 1: Creating more pairs than the Maximum Initial Copy Activities setting

In this example, you are creating four pairs at the same time, and the Maximum Initial Copy Activities option is set to 2. To control the order in which the pairs are created, you set the Initial Copy Priority option in the Create TC Pairs window as shown in the following table.

The following table shows the order in which the initial copy operations are performed and the Initial Copy Priority settings for the P-VOLs.

Because the Maximum Initial Copy Activities setting is 2, the initial copy operations for LDEV 02 and LDEV 00 are started at the same time. When one of these initial copy operations is completed, the initial copy operation for LDEV 01 is started. When the next initial copy operation is completed, the initial copy operation for LDEV 03 is started.

Example 2: New pairs added with initial copy operations in progress

In this example, you have already started the initial copy operations for the four pairs shown above (LDEVs 00-03) with the Maximum Initial Copy Activities option set to 2, and then you create two more pairs (LDEVs 10 and 11) while the initial copy operations for the first four pairs are still in progress. To control the order in which the pairs are created, you set the Initial Copy Priority option for the new pairs as shown in the following table.

The two new initial copy operations are started after all four of the previously scheduled initial copy operations are completed. The following table shows the order in which the initial copy operations are performed for all six pairs and the Initial Copy Priority setting for each pair.