Patent application number | Description | Published |
20090070618 | SYSTEM AND METHOD FOR CALIBRATING A TOD CLOCK - A system, method and computer program product for calibrating a Time Of Day (TOD)-clock in a computing system node provided in a multi-node network. The network comprises an infrastructure of computing devices each having a physical clock providing a time base for executing operations that is stepped to a common oscillator. The system implements steps for obtaining samples of timing values of a computing device in the network, the values including a physical clock value maintained at that device and a TOD-offset value; computing an oscillator skew value from the samples; setting a fine steering rate value as equal to the opposite of the computed oscillator skew value; and, utilizing the fine steering rate value to adjust the physical clock value and correct for potential oscillator skew errors occurring in the oscillator crystal at the computing device. | 03-12-2009 |
20110137861 | Methods for Achieving Efficient Coherent Access to Data in a Cluster of Data Processing Computing Nodes - A coherency manager provides coherent access to shared data by receiving a copy of updated database data from a host computer through RDMA, the copy including updates to a given database data; storing the copy of the updated database data as a valid copy of the given database data in local memory; invalidating local copies of the given database data on other host computers through RDMA; receiving acknowledgements from the other host computers through RDMA that the local copies of the given database data have been invalidated; and sending an acknowledgement of receipt of the copy of the updated database data to the host computer through RDMA. When the coherency manager receives a request for the valid copy of the given database data from a host computer through RDMA, it retrieves the valid copy of the given database data from the local memory and returns the valid copy through RDMA. | 06-09-2011 |
20110191625 | CONTROLLING THE STATE OF DUPLEXING OF COUPLING FACILITY STRUCTURES - A coupling facility is coupled to one or more other coupling facilities via one or more peer links. The coupling of the facilities enables various functions to be supported, including the duplexing of structures of the coupling facilities. Duplexing is performed on a structure basis, and thus, a coupling facility may include duplexed structures, as well as non-duplexed or simplexed structures. | 08-04-2011 |
20110302375 | Multi-Part Aggregated Variable in Structured External Storage - A mechanism is provided for multi-part aggregated variables in structured external storage. The shared external storage provides a serialized, aggregated structure update capability. The shared external storage identifies each local value for which a group value is needed by name. Each time a member writes out its value, the member specifies the name of the object, the member's current value, and the type of aggregate function to apply (e.g., minimum, maximum, etc.). The structured external storage in one atomic operation updates the member's value, recalculates the aggregate of all of the individual values, and returns the aggregate to the member. The advantage of this approach is that it requires only one write operation to the structured external storage. The update operation does not require locking, because the operation is atomic. | 12-08-2011 |
20110302377 | Automatic Reallocation of Structured External Storage Structures - A mechanism for automatic reallocation of shared external storage structures is provided. The shared external storage divides the dynamically allocable storage into fixed sized blocks referred to as allocation units. To create an object of a specific type, the shared external storage uses some number of allocation units. If the object will fit in one allocation unit, then it is placed in one allocation unit. If the object is larger than one allocation unit, then the appropriate number of allocation units is obtained and chained together to contain all of the information of the required object. When an object so allocated is no longer needed, the shared external storage breaks the object down to a set of one or more fixed sized allocation units. The shared external storage then returns the allocation units to the pool of available objects. | 12-08-2011 |
20120317312 | MANAGING OPERATOR MESSAGE BUFFERS IN A COUPLING FACILITY - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 12-13-2012 |
20120317402 | EXECUTING A START OPERATOR MESSAGE COMMAND - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 12-13-2012 |
20120317436 | OPERATOR MESSAGE COMMANDS FOR TESTING A COUPLING FACILITY - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 12-13-2012 |
20120317584 | PROCESSING OPERATOR MESSAGE COMMANDS - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 12-13-2012 |
20120317585 | TRANSMITTING OPERATOR MESSAGE COMMANDS TO A COUPLING FACILITY - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 12-13-2012 |
20130074099 | TRANSMITTING OPERATOR MESSAGE COMMANDS TO A COUPLING FACILITY - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 03-21-2013 |
20130081057 | PROCESSING OPERATOR MESSAGE COMMANDS - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 03-28-2013 |
20130081058 | EXECUTING A START OPERATOR MESSAGE COMMAND - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 03-28-2013 |
20130086428 | OPERATOR MESSAGE COMMANDS FOR TESTING A COUPLING FACILITY - A facility is provided to enable operator message commands from multiple, distinct sources to be provided to a coupling facility of a computing environment for processing. These commands are used, for instance, to perform actions on the coupling facility, and may be received from consoles coupled to the coupling facility, as well as logical partitions or other systems coupled thereto. Responsive to performing the commands, responses are returned to the initiators of the commands. | 04-04-2013 |
20130179553 | CONTROLLING THE STATE OF DUPLEXING OF COUPLING FACILITY STRUCTURES - A coupling facility is coupled to one or more other coupling facilities via one or more peer links. The coupling of the facilities enables various functions to be supported, including the duplexing of structures of the coupling facilities. Duplexing is performed on a structure basis, and thus, a coupling facility may include duplexed structures, as well as non-duplexed or simplexed structures. | 07-11-2013 |
20130246713 | CONDITIONAL WRITE PROCESSING FOR A CACHE STRUCTURE OF A COUPLING FACILITY - A method for managing a cache structure of a coupling facility includes receiving a conditional write command from a computing system and determining whether data associated with the conditional write command is part of a working set of data of the cache structure. If the data associated with the conditional write command is part of the working set of data of the cache structure the conditional write command is processed as an unconditional write command. If the data associated with the conditional write command is not part of the working set of data of the cache structure a conditional write failure notification is transmitted to the computing system. | 09-19-2013 |
20140101391 | CONDITIONAL WRITE PROCESSING FOR A CACHE STRUCTURE OF A COUPLING FACILITY - A method for managing a cache structure of a coupling facility includes receiving a conditional write command from a computing system and determining whether data associated with the conditional write command is part of a working set of data of the cache structure. If the data associated with the conditional write command is part of the working set of data of the cache structure the conditional write command is processed as an unconditional write command. If the data associated with the conditional write command is not part of the working set of data of the cache structure a conditional write failure notification is transmitted to the computing system. | 04-10-2014 |
20140281342 | MIGRATING AND RETRIEVING QUEUED DATA IN BYTE-ADDRESSABLE STORAGE - In an exemplary embodiment of this disclosure, a computer-implemented method may include storing in a primary storage a plurality of list entries belonging to an ordered list. Free space in the primary storage may be monitored to determine whether a first predetermined condition related to the free space is met. In a secondary storage, a storage block of a predetermined size may be allocated for migration, when the first predetermined condition is met. A cursor may be provided pointing to a first list entry in the primary storage. One or more list entries may be selected at the cursor. The selected list entries may be migrated to the storage block while maintaining their order in the list. | 09-18-2014 |
20150058585 | MIGRATING AND RETRIEVING QUEUED DATA IN BYTE-ADDRESSABLE STORAGE - In an exemplary embodiment of this disclosure, a computer-implemented method may include storing in a primary storage a plurality of list entries belonging to an ordered list. Free space in the primary storage may be monitored to determine whether a first predetermined condition related to the free space is met. In a secondary storage, a storage block of a predetermined size may be allocated for migration, when the first predetermined condition is met. A cursor may be provided pointing to a first list entry in the primary storage. One or more list entries may be selected at the cursor. The selected list entries may be migrated to the storage block while maintaining their order in the list. | 02-26-2015 |