The N series models are designed to provide fast data access, simultaneous multiprotocol support, expandability, upgradeability, and low maintenance requirements. Additional functions, such as snapshot, compliance, mirroring, and business continuance capability, are available through optional licensed functions.The IBM System Storage N7600 storage controller includes the Model A20, an active/active dual-node base unit. This model is designed to provide fast data access, simultaneous multiprotocol support, expandability, upgradeability, and low maintenance requirements.