AGGRESSIVE RECLAMATION OF TIER-1 STORAGE SPACE IN PRESENCE OF COPY-ON-WRITE SNAPSHOTS

Reclamation of storage space in presence of copy-on-write snapshot. In one embodiment, a reclamation command is generated. In response to generating the reclamation command, first data held within one storage device is copied to another storage device via a communication link. One or more first physical memory regions of the one storage device, which stores the first data, is allocated to a first region of a data volume. The other storage device is configured to store a copy-on-write snapshot of the data volume. In response to copying the first data, de-allocate the one or more first physical memory regions from the first data volume region.