Patent ID: 9009402
Filing Date: 2015-04-14
Classification: G06F,G11C

Abstract:
1. A data storage system with backup protection using data replication, the system comprising: at least one source CAS data storage space; and a destination data storage space not having or not known to have CAS capabilities; said source CAS storage space comprising: an input for receiving data and corresponding addresses for storage in the source data storage space; a hash key generator for generating a hash key of a data item; a hash key to address storage table configured to store respective hash keys in the source storage space in association with corresponding logical addresses, to retrieve said addresses following input of a hash key; an address to hash key storage table connecting each logical address to a respective corresponding hash key, to retrieve respective hash keys following input of a respective address; a hash key inspection unit configured to compare stored hash keys against hash keys generated from further data items arriving at the source storage space to determine whether respective further data items are already stored, the source storage system configured to transfer, to said destination storage space, respective further data items together with corresponding addresses if no match is made to a stored hash key, and if a match is made to a stored hash key, then to transfer to said destination storage space both said address corresponding to respective further data items and respective addresses corresponding to said stored hash keys, without transferring said respective further data item; and said destination data storage space being configured to use said address corresponding to said stored hash key to obtain said respective further data item and to copy said respective further data item to said address corresponding to said data item.