Transparent Access to Local or Remote I/O Via Various Channels And/Or Links
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
A method is described to handle switched serial link attached I/O buses by connecting and controlling I/O buses, either local or remote, and providing program access in an identical manner. This system consists of multiple processors, workstations, and control units interconnected through a central switch via a high speed serial link, as shown in Fig. 1. A given node within the system may contain an I/O bus with 'local' I/O adapters. When viewed from another node within the system these 'local' I/O adapters will be considered as 'remote' (to this other node). Furthermore, a processor node can be granted control over a given 'remote' I/O adapter. Control of this 'remote' I/O adapter is then exercised through the use of Load or Store instructions. Fig. 2 shows the general system structure.