After a Thin Image pair is deleted, restored, or resynchronized, or snapshot data is deleted, some areas that store unnecessary data exist in the snapshot data area. These data areas are referred to as garbage. Garbage can be reused only when snapshot data is stored in the same snapshot tree, and it cannot be used for other purposes.
The defrag function consolidates the areas being used to return the pages that store only garbage data to unallocated pages.
Important: SVOS RF 9.4 defragmentation commands only support VSP 5000 series storage.
The following are the effects of defragmentation:
- The free space of the pool increases.
- The released pages can be used for other purposes.
You can specify the root volume and start the defragmentation process (defrag processing). The defrag processing is performed for the snapshot data area, and the processing finishes when the amount of the remaining garbage becomes less than 1 GB.
