| 摘要 |
Embodiments of the present invention are directed to efficient snapshot operations that produce multiple, useable snapshot logical units when successively directed to a logical unit, and to mass-storage arrays that support such efficient snapshot operations. In one embodiment of the present invention, allocate-on-write techniques are employed for handling WRITE access operations directed to storage-allocation units not yet overwritten following a snapshot operation. The allocate-on-WRITE technique is enhanced by a background process that continuously defragments the logical-storage-allocation-unit address space referenced by the original logical unit.
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