Patent ID: 7552280

Claim:
A storage controller for accessing data stored in a plurality of logical volumes divisible into a first logical volume and a second logical volume, each logical volume being replicated on first and second storage elements, each replication storing the same data, comprising: a storage-element selector receiving input/output (I/O) access requests, the storage-element selector directing each I/O access request targeted to the first logical volume to one of the first and second storage elements; and an interleaving module in communication with the storage-element selector, the interleaving module comprising a ratio generator providing an asymmetric interleaving ratio for use in distributing I/O accesses to the first and second storage elements, and an interleaver receiving the asymmetric interleaving ratio and asymmetrically interleaving between the first and second storage elements according to the asymmetric interleaving ratio, I/O access requests targeting the second logical volume.