Create a disk group with three physical drives. Then, create two logical devices (labeled 1 and 2) in the disk group such that you have no available free space. The logical device stripes look similar to the following.
Later, you decide you need additional space in the logical devices in the disk group. First, you must add more physical drives to the disk group.
Note: Blocks are
labeled as x and * in these examples. All
blocks labeled x are the same size in logical device 1. All blocks labeled
* are the same size in logical device 2.
If you add two additional physical drives to the disk group, the logical devices migrate such that they are striped across all five drives. The Adaptec Storage Manager expands the size of each logical device in proportion to the original configuration. If there originally was free space in the disk group, the free space is increased also.
Note: The figure above depicts
two logical device migrations: one for logical device 1, another for logical device 2.
When increasing logical device space, you can add any number of physical drives, as long as the sum of the physical drives does not exceed the maximum physical drives allowed for the disk group. The maximum number of physical drives you can have in an disk group is limited by the controller stripe size.
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