Terminating End-Of-Chain Processing in the Multipathing Arrangement
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19
Dynamic pathing between a host processor and a peripheral system is manifested by groups of channels in a buffered or cached peripheral system. Where there has been no disconnection during the input/output processing, the channel END data for terminating a chained operation is stored in the cache for immediate reporting to the host processor. This arrangement reduces control unit busy time to the group of channels. The figure shows a plurality of channels which can be dynamically grouped for multipathing between the host processor (not shown) and a group of storage directors of a peripheral system. A command may be received by a storage director over one of the channels with a response by the storage director back to the host processor traveling over a different channel within the same group of channels.