Abstract: Provided are a system, and article of manufacture in which data is received at the first storage unit. A first information unit, a second information unit, and a third information unit are generated, wherein the first information unit, the second information unit, and the third information unit each include a portion of the received data and computed parity data. The first information unit is stored in the first storage unit at the first site. The second information unit is distributed to the second storage unit at the second site for storage. The third information unit is distributed to the third storage unit at the third site for storage.

Abstract: Provided is a method in which data is received at the first storage unit. A first information unit, a second information unit, and a third information unit are generated, wherein the first information unit, the second information unit, and the third information unit each include a portion of the received data and computed parity data. The first information unit is stored in the first storage unit at the first site. The second information unit is distributed to the second storage unit at the second site for storage. The third information unit is distributed to the third storage unit at the third site for storage.

Abstract: Provided are a system, and article of manufacture in which data is received at the first storage unit. A first information unit, a second information unit, and a third information unit are generated, wherein the first information unit, the second information unit, and the third information unit each include a portion of the received data and computed parity data. The first information unit is stored in the first storage unit at the first site. The second information unit is distributed to the second storage unit at the second site for storage. The third information unit is distributed to the third storage unit at the third site for storage.

Abstract: A volume provisioning advisor for managing storage allocation in a plurality of virtual storage subsystems is disclosed. A request for data storage and workload requirements is received from a user. Performance information for storage controllers and managed disks within a virtualization engine is received. Resource groups are defined based on the received performance information and available managed disks, and their utilizations tracked. Resource group performance within the virtualization engine is predicted based on the user workload requirements and existing or historical resource group utilization. Storage is allocated to one or more managed disks within the virtualization engine based on predicted resource group performance.

Abstract: Provided are a method, system, and article of manufacture in which a first storage unit at a first site is coupled to a second storage unit at a second site and a third storage unit at a third site. Data is received at the first storage unit. The received data is divided into a first part and a second part. The first part of the data is stored in the first storage unit at the first site. The second part of the data is distributed to the second storage unit at the second site for storage. Parity data corresponding to the first part of the data and the second part of the data is computed. The parity data is distributed to the third storage unit at the third site for storage. Additionally, provided also are a method, system, and article of manufacture in which data is received at the first storage unit.

Abstract: A method, apparatus and program storage device for providing automatic performance optimization of virtualized storage allocation within a network of storage elements is disclosed. A request for storage of data is received and workload requirements of the user making the request are obtained. System parameters are analyzed and storage is provided to meet the desired performance requirements based on analysis of system parameters.

Abstract: A method and means for emulating realistic access requests used in static or dynamic performance testing of a disk-based storage subsystem. The method and means are based on the fact that a test driver can substitute for an actual application if an executing process generates a pattern of accesses to disk subsystem addresses as a prescribed random walk function among a cluster of contiguous tracks associated with the process. The access pattern will emulate both locality of referencing and the fact that the likelihood of rereferencing the same track varies inversely over time.