Deduplication Overview -- NetApp Storage Efficiency :
Deduplication is a technique which is used to reduce space by discarding duplicate blocks.
when SIS (single instance storage) is run on volume it scans each and every block and assigns digital signature and then it will compare all the signatures. The block which have same signature is considered to be having same data, hence it will keep only one block and discards remaining blocks.
The inodes are adjusted to point only one block.
Deduplication – The NetApp Approach
