Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A single link interface communicatively couples the send component to the receive component. The single link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A link interface communicatively couples the send component to the receive component. The link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A link interface communicatively couples the send component to the receive component. The link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: An abstraction for storage class memory is provided that hides the details of the implementation of storage class memory from a program, and provides a standard channel programming interface for performing certain actions, such as controlling movement of data between main storage and storage class memory or managing storage class memory.

Abstract: Management of storage used by pageable guests of a computing environment is facilitated. A query instruction is provided that details information regarding the storage location indicated in the query. It specifies whether the storage location, if protected, is protected by host-level protection or guest-level protection.

Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A link interface communicatively couples the send component to the receive component. The link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: Management of storage used by pageable guests of a computing environment is facilitated. A query instruction is provided that details information regarding the storage location indicated in the query. It specifies whether the storage location, if protected, is protected by host-level protection or guest-level protection.

Abstract: An abstraction for storage class memory is provided that hides the details of the implementation of storage class memory from a program, and provides a standard channel programming interface for performing certain actions, such as controlling movement of data between main storage and storage class memory or managing storage class memory.

Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A link interface communicatively couples the send component to the receive component. The link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: Management of storage used by pageable guests of a computing environment is facilitated. A query instruction is provided that details information regarding the storage location indicated in the query. It specifies whether the storage location, if protected, is protected by host-level protection or guest-level protection.

Abstract: Embodiments are directed to a computer system for managing data transfer. The computer system includes a memory, a processor communicatively coupled to the memory, a send component and a receive component having a message queue and a controller. A link interface communicatively couples the send component to the receive component. The link interface includes a mainline channel and a sideband channel, and the computer system is configured to perform a method. The method includes transmitting mainline channel messages over the mainline channel from the send component to the receive component. The method further includes transmitting sideband channel messages over the sideband channel from the send component to the message queue of the receive component. The method further includes utilizing the controller to control a flow of the sideband channel messages to the message queue without relying on sending feedback to the send component about the flow.

Abstract: A method, computer program product, and system to control event logging and error recovery in a system including adapters, ports, and channels are described. The method includes storing a recovery threshold for each event type among a plurality of event types and storing a level-specific logging threshold for each event type, implementing event handlers for each of the channels, the ports, and the adapters of the system, and implementing a threshold manager for the events identified by the event handlers based on the level-specific logging threshold and the recovery threshold for each of the respective event types of each of the events. For any identified event corresponding with a given event type, the implementing the threshold manager includes considering the recovery threshold and the level-specific logging threshold at every level regardless of a level at which the identified event is identified.

Abstract: An abstraction for storage class memory is provided that hides the details of the implementation of storage class memory from a program, and provides a standard channel programming interface for performing certain actions, such as controlling movement of data between main storage and storage class memory or managing storage class memory.

Abstract: Embodiments relate to path selection for packet transfer in a network. An aspect includes a method of selecting a path among a plurality of paths in a network for transfer of a packet from a first system to a second system in the network. The method includes storing, in a memory device, a static path performance vector indicating a tier among a plurality of tiers corresponding with each of the plurality of paths, each of the plurality of tiers corresponding with a relative performance level. The method also includes maintaining a path availability bit vector indicating an availability of each of the plurality of paths, and selecting, using a processor, the path among the plurality of paths based on the path performance vector and the path availability bit vector.

Abstract: Embodiments relate to path selection for packet transfer in a network. An aspect includes a method of selecting a path among a plurality of paths in a network for transfer of a packet from a first system to a second system in the network. The method includes storing, in a memory device, a static path performance vector indicating a tier among a plurality of tiers corresponding with each of the plurality of paths, each of the plurality of tiers corresponding with a relative performance level. The method also includes maintaining a path availability bit vector indicating an availability of each of the plurality of paths, and selecting, using a processor, the path among the plurality of paths based on the path performance vector and the path availability bit vector.

Abstract: Management of storage used by pageable guests of a computing environment is facilitated. A query instruction is provided that details information regarding the storage location indicated in the query. It specifies whether the storage location, if protected, is protected by host-level protection or guest-level protection.

Abstract: A method, computer program product, and system to control event logging and error recovery in a system including adapters, ports, and channels are described. The method includes storing a recovery threshold for each event type among a plurality of event types and storing a level-specific logging threshold for each event type, implementing event handlers for each of the channels, the ports, and the adapters of the system, and implementing a threshold manager for the events identified by the event handlers based on the level-specific logging threshold and the recovery threshold for each of the respective event types of each of the events. For any identified event corresponding with a given event type, the implementing the threshold manager includes considering the recovery threshold and the level-specific logging threshold at every level regardless of a level at which the identified event is identified.

Abstract: Embodiments relate to path selection for packet transfer in a network. An aspect includes a method of selecting a path among a plurality of paths in a network for transfer of a packet from a first system to a second system in the network. The method includes storing, in a memory device, a static path performance vector indicating a tier among a plurality of tiers corresponding with each of the plurality of paths, each of the plurality of tiers corresponding with a relative performance level. The method also includes maintaining a path availability bit vector indicating an availability of each of the plurality of paths, and selecting, using a processor, the path among the plurality of paths based on the path performance vector and the path availability bit vector.

Abstract: An abstraction for storage class memory is provided that hides the details of the implementation of storage class memory from a program, and provides a standard channel programming interface for performing certain actions, such as controlling movement of data between main storage and storage class memory or managing storage class memory.

Abstract: A method, computer program product, and system to control event logging and error recovery in a system including adapters, ports, and channels are described. The method includes storing a recovery threshold for each event type among a plurality of event types and storing a level-specific logging threshold for each event type, implementing event handlers for each of the channels, the ports, and the adapters of the system, and implementing a threshold manager for the events identified by the event handlers based on the level-specific logging threshold and the recovery threshold for each of the respective event types of each of the events. For any identified event corresponding with a given event type, the implementing the threshold manager includes considering the recovery threshold and the level-specific logging threshold at every level regardless of a level at which the identified event is identified.