Patent Number: 6,167,459

Title: System for reassigning alias addresses to an input/output device

Abstract: Disclosed is a system for reassigning addresses. A first processing unit, such as a storage controller, provides at least two base addresses for addressing devices, such as volumes of a direct access storage device (DASD) and a plurality of alias addresses. An alias address associated with a base address provides an address for addressing the device addressed by the base address. The first processing unit processes a command transmitted from a second processing unit, such as a host system that accesses the DASD through the storage controller, to reassign an alias address from a first base address to a second base address. The first base address addresses a first device and the second base address addresses a second device. The first processing unit then indicates that the alias address to reassign is not associated with the first base address and is associated with the second base address. The second device addressed by the second base addresses is capable of being addressed by the reassigned alias address. The first processing unit signals the second processing unit after the first processing unit indicates that the alias address was reassigned from the first base address to the second base address.

Inventors: Beardsley; Brent Cameron (Tucson, AZ), Meritt; Allan Samuel (Poughkeepsie, NY), Paulsen; Michael Aloysius (Morgan Hill, CA), Yudenfriend; Harry Morris (Poughkeepsie, NY)

Assignee: International Business Machines Corporation

International Classification: G06F 13/10 (20060101); G06F 013/00 (); G06F 013/10 ()

Expiration Date: 12/26/2017