| 摘要 |
System and method for reducing costs of moving data between two or more of multi-tiered storage devices. Specifically, the system operates by moving only high tier portion of data and merely remapping the low tier data to migration target device, which eliminates a large amount of data movement (low tier) while maintaining the SLA of high tier data. Specifically, when a command to migrate a thin provisioned volume is received from a source primary storage device to another target primary storage device, the system doesn't copy all of the tier1 and tier2 chunk data that the source thin provisioned volume holds, but copies only tier1 chunk data to the target storage device. The copy operation is performed after the storage system prepared the target thin provisioned volume on the target side. After that, tier2 chunks are remapped from the primary storage device to another target primary storage device without copying. |
