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HP 3PAR Priority Optimization Software enables service levels for applications and workloads as business requirements dictate. HP 3PAR Priority Optimization enables customer to provision storage performance as they can provision storage capacity; this allows them to create SLAs to protect mission critical applications in enterprise environments by assigning a minimum goal for I/O per second, bandwidth and latency so performance for that specific tenant or application is assured. Or assign performance max limits on workloads with lower service level requirements. Provide high priority applications with all the resources they need to meet service levels. Enable certainty and predictability for all applications and tenants. Configure service level objectives-I/O per Seconds limit and I/O Bandwidth limit, on a Virtual Volume Set (VVset) or between different Virtual Domains. A Virtual Volume Set may contain a single volume or multiple volumes. A Virtual Volume may also belong to multiple Virtual Volume Sets allowing user to create hierarchical rules. All host I/O on the VVset is monitored and measured against the Service Level objective. HP 3PAR Priority Optimization control is implemented within the HP 3PAR StoreServ Storage System and can be modified in real time. No host agents are required. Further, no physical partitioning of resources within the storage array is required.