Patents by Inventor Matthew J. Kalos

Matthew J. Kalos has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • GENERATING A HEALTH CONDITION MESSAGE ON A HEALTH CONDITION DETECTED AT A SERVER TO SEND TO A HOST SYSTEM ACCESSING THE SERVER
    Publication number: 20190179719
    Abstract: Provided are a computer program product, system, and method for generating a health condition message on a health condition detected at a first server to send to a host system accessing the first server. A determination is made of a health condition with respect to access to a first storage. A determination is made of an estimated Input/Output (I/O) delay to access the first storage resulting from the determined health condition. A health condition message is generated indicating the estimated I/O delay. The health condition message is transmitted to the host system, wherein the host system uses the estimated I/O delay to determine whether to perform a swap operation to redirect host I/O requests to data from the first server to a second server.
    Type: Application
    Filed: February 20, 2019
    Publication date: June 13, 2019
    Inventors: Clint A. Hardy, Matthew J. Kalos
  • Performing preprocessing operations in anticipation of log file writes
    Patent number: 10318192
    Abstract: A location of a log file is determined, wherein data corresponding to writes is written sequentially starting from a starting block of the log file. A determination is made in the log file of a range of blocks in which data corresponding to a next write is anticipated to be written. Preprocessing operations are performed corresponding to the range of blocks of the log file in which the data corresponding to the next write is anticipated to be written.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: June 11, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • Populating a secondary cache with unmodified tracks in a primary cache when redirecting host access from a primary server to a secondary server
    Patent number: 10320936
    Abstract: Provided are a computer program product, system, and method for populating a secondary cache with unmodified tracks in a primary cache when redirecting host access from a primary server to a secondary server. Host access to tracks is redirected from the primary server to the secondary server. Prior to the redirecting, updates to tracks in the primary storage were replicated to the secondary server. After the redirecting host access to the secondary server, host access is directed to the secondary server and the secondary storage. A secondary cache at the secondary server is populated with unmodified tracks in a primary cache at the primary server when the host access was redirected to the secondary server to make available to the host access redirected to the secondary server.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: June 11, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos, Brian A. Rinaldi
  • DEVICE RESERVATION STATE PRESERVATION IN DATA MIRRORING
    Publication number: 20190163577
    Abstract: One general aspect of device reservation state preservation in accordance with the present description, provides for an intermediate reservation state, referred to herein as a “peer” reservation state, which may be maintained by a storage controller in the event of a total loss of communication connectivity to the reserving host so long as a peer or partner storage controller of a mirror relationship still has communication connectivity to the host. The peer reservation state as used herein, is a reservation state intermediate between a full reservation state for a device, and a fully released state in which a reservation of the device has been completely released. Other features and aspects may be realized, depending upon the particular application.
    Type: Application
    Filed: November 30, 2017
    Publication date: May 30, 2019
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Carol S. Mellgren, John G. Thompson
  • DEVICE RESERVATION MANAGEMENT FOR OVERCOMING COMMUNICATION PATH DISRUPTIONS
    Publication number: 20190163576
    Abstract: One general aspect of device reservation management in accordance with the present description, is directed to a host issuing I/O data requests to a primary device which synchronously mirrors data to a secondary data storage device wherein both devices are reserved for exclusive use by the host for I/O data requests. In response to a loss of communication connectivity on all paths to the primary storage controller controlling the primary device, the host confirms whether a communication path to the primary device has been established and whether the primary device remains reserved to the host. Upon successful confirmations, the reservation of the primary device is repaired such that I/O data requests to the reserved primary device continue. Other features and aspects may be realized, depending upon the particular application.
    Type: Application
    Filed: November 30, 2017
    Publication date: May 30, 2019
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Tri M. Hoang, Matthew J. Kalos, John G. Thompson, Harry M. Yudenfriend
  • DEVICE RESERVATION STATE SYNCHRONIZATION IN DATA MIRRORING
    Publication number: 20190163373
    Abstract: One general aspect of device reservation state synchronization in accordance with the present description, device reservation management logic ensures synchronization of reservation states of primary and secondary volumes of a mirror relationship in the event of a change in the state of the mirroring relationship such as achieving full data synchronization between the volumes. Other features and aspects may be realized, depending upon the particular application.
    Type: Application
    Filed: November 30, 2017
    Publication date: May 30, 2019
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Carol S. Mellgren, John G. Thompson
  • Preservation of modified cache data in local non-volatile storage following a failover
    Patent number: 10303607
    Abstract: A dual-server based storage system maintains a first cache and a first non-volatile storage (NVS) in a first server, and a second cache and a second NVS in a second server, where data in the first cache is also written in the second NVS and data in the second cache is also written in the first NVS. In response to a failure of the first server, a determination is made as to whether space exists in the second NVS to accommodate the data stored in the second cache. In response to determining that space exists in the second NVS to accommodate the data stored in the second cache, the data is transferred from the second cache to the second NVS.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: May 28, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • Extent-level reserve and release for a direct access storage device (DASD) volumes
    Patent number: 10303380
    Abstract: In one embodiment, a computer program product for managing a reserve command includes a computer readable storage medium having program code embodied therewith, the program code readable and/or executable by a processor to receive, by the processor, a request to access a data set on one or more volumes of at least one direct access storage device (DASD), the request including a reserve command, and each of the one or more volumes including a consecutive set of one or more tracks of the at least one DASD, and reserve one or more extents of the at least one DASD while reserving less than a volume of the at least one DASD and not allowing any other entity than an entity which requested the reserve to access the one or more extents of the at least one DASD that have been reserved.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: May 28, 2019
    Assignee: International Business Machines Corporation
    Inventors: Susan K. Candelaria, Clint A. Hardy, Gavin S. Johnson, Matthew J. Kalos, Michael J. Koester, John R. Paveza, Carrie J. Van Noorden
  • PROCESSING OF A SET OF PENDING OPERATIONS FOR A SWITCHOVER FROM A FIRST STORAGE RESOURCE TO A SECOND STORAGE RESOURCE
    Publication number: 20190155509
    Abstract: A determination is made that data stored in an extent of a first storage resource is to be moved to an extent of a second storage resource. Operations that are still awaiting to start execution in the first storage resource after the data stored in the extent of the first storage resource has been moved to the extent of the second storage resource, are configured for execution in the second storage resource.
    Type: Application
    Filed: January 22, 2019
    Publication date: May 23, 2019
    Inventors: Matthew G. Borlick, Clint A. Hardy, Matthew J. Kalos, Karl A. Nielsen, Richard B. Stelmach, Hui Zhang
  • PROCESSING A HEALTH CONDITION MESSAGE ON A HEALTH CONDITION TO DETERMINE WHETHER TO PERFORM A SWAP OPERATION
    Publication number: 20190146894
    Abstract: Provided are a computer program product, system, and method for processing a health condition message on a health condition to determine whether to perform a swap operation. A health condition message is received from a first server indicating an estimated Input/Output (I/O) delay to access a first storage resulting from a health condition experienced at the first server. A determination is made as to whether the estimated I/O delay exceeds a threshold response time for the first storage. A swap operation is performed to redirect I/O requests to data from the first server to the second server to access the data at the second storage in response to determining that the estimated I/O delay exceeds the threshold response time.
    Type: Application
    Filed: January 10, 2019
    Publication date: May 16, 2019
    Inventors: Clint A. Hardy, Matthew J. Kalos
  • Adjustment of buffer credits and other parameters in a startup phase of communications between a plurality of channels and a control unit
    Patent number: 10289591
    Abstract: A control unit provides a number of buffer credits, to one or more channels, in response to an initiation of a startup phase of communication between the one or more channels and the control unit, where the provided number of buffer credits when used for transferring data causes transfer ready operations but no retry operations. The control unit iteratively increases the number of buffer credits by an amount that is high enough to eliminate any transfer ready operations or cause retry operations to occur within a predetermined amount of time from the initiation of the startup phase.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: May 14, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Roger G. Hathorn, Bret W. Holley, Matthew J. Kalos
  • Using cache lists for processors to determine tracks to demote from a cache
    Patent number: 10282303
    Abstract: Provided are a computer program product, system, and method for using cache lists for processors to determine tracks in a storage to demote from a cache. Tracks in the storage stored in the cache are indicated in lists. There is one list for each of a plurality of processors. Each of the processors processes the list for that processor to process the tracks in the cache indicated on the list. There is a timestamp for each of the tracks indicated in the lists indicating a time at which the track was added to the cache.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: May 7, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos
  • Device reservation state preservation in data mirroring
    Patent number: 10282258
    Abstract: One general aspect of device reservation state preservation in accordance with the present description, provides for an intermediate reservation state, referred to herein as a “peer” reservation state, which may be maintained by a storage controller in the event of a total loss of communication connectivity to the reserving host so long as a peer or partner storage controller of a mirror relationship still has communication connectivity to the host. The peer reservation state as used herein, is a reservation state intermediate between a full reservation state for a device, and a fully released state in which a reservation of the device has been completely released. Other features and aspects may be realized, depending upon the particular application.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 7, 2019
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Carol S. Mellgren, John G. Thompson
  • Using cache lists for processors to determine tracks to demote from a cache
    Patent number: 10229064
    Abstract: Provided are a computer program product, system, and method for using cache lists for processors to determine tracks in a storage to demote from a cache. Tracks in the storage stored in the cache are indicated in lists. There is one list for each of a plurality of processors. Each of the processors processes the list for that processor to process the tracks in the cache indicated on the list. There is a timestamp for each of the tracks indicated in the lists indicating a time at which the track was added to the cache. Tracks indicated in each of the lists having timestamps that fall within a range of timestamps are demoted.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: March 12, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos
  • Synchronous input / output hardware acknowledgement of write completions
    Patent number: 10229084
    Abstract: A computer-implemented method for computer-implemented method for communicating completion of synchronous input/output (I/O) commands between a processor executing an operating system and a recipient control unit is described. The method may include issuing, by a processor, a Synchronous I/O command to the recipient control unit; receiving, with the processor, a DMA read request from the recipient control unit; converting, with the processor, the DMA read response to write a data record into memory of the recipient control unit; issuing the DMA read request to the recipient control unit, wherein the DMA read request comprises an echo read portion comprising at least one byte of information at the end of the data record written; receiving, by the processor, a DMA write confirmation comprising the echo read portion of the record; and writing the echo read portion to a status area.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: March 12, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Scott A. Brewer, David F. Craddock, Matthew J. Kalos, Matthias Klein, Eric N. Lais
  • Generating a health condition message on a health condition detected at a server to send to a host system accessing the server
    Patent number: 10229013
    Abstract: Provided are a computer program product, system, and method for generating a health condition message on a health condition detected at a first server to send to a host system accessing the first server. A determination is made of a health condition with respect to access to a first storage. A determination is made of an estimated Input/Output (I/O) delay to access the first storage resulting from the determined health condition. A health condition message is generated indicating the estimated I/O delay. The health condition message is transmitted to the host system, wherein the host system uses the estimated I/O delay to determine whether to perform a swap operation to redirect host I/O requests to data from the first server to a second server.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: March 12, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Clint A. Hardy, Matthew J. Kalos
  • SYNCHRONOUSLY PERFORMING COMMIT RECORDS OPERATIONS
    Publication number: 20190073142
    Abstract: Provided are techniques for synchronously performing commit records operations. A local copy of a commit records message is built for a Non-Volatile Storage (NVS) track, with a valid indicator set to indicate that this commit records message is valid and has not been processed yet. A Direct Memory Access (DMA) chain is executed to transfer customer data from a host to real segments and alternate segments of a track buffer and to transfer the local copy of the commit records message to a mail message structure of a mail message array. At DMA completion, an NVS manager is synchronously called to perform a commit records operation with the commit records message in the mail message structure. In response to the commit records operation completing, there is an indication that a new write DMA is allowed to proceed for the NVS track.
    Type: Application
    Filed: September 5, 2017
    Publication date: March 7, 2019
    Inventors: Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos, Beth A. Peterson, Louis A. Rasor
  • USING REAL SEGMENTS AND ALTERNATE SEGMENTS IN NON-VOLATILE STORAGE
    Publication number: 20190073317
    Abstract: Provided are techniques for using real segments and alternate segments in Non-Volatile Storage (NVS). One or more write requests for a track are executed by alternating between storing data in one or more sectors of real segments and one or more sectors of alternate segments for each of the write requests, while setting indicators in a real sector structure and an alternate sector structure. In response to determining that the one or more write requests for the track have completed, the data stored in the one or more sectors of the real segments and in the one or more sectors of the alternate segments are merged to form newly written data. In response to determining that a hardened, previously written data of a track does exist in Non-Volatile Storage (NVS), the newly written data is merged with the hardened, previously written data in the NVS. The merged data is committed.
    Type: Application
    Filed: September 5, 2017
    Publication date: March 7, 2019
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • ASYNCHRONOUS UPDATE OF METADATA TRACKS IN RESPONSE TO A CACHE HIT GENERATED VIA AN I/O OPERATION OVER A BUS INTERFACE
    Publication number: 20190073301
    Abstract: A cache hit is generated, in response to receiving an input/output (I/O) command over a bus interface. An update for a metadata track is stored in a buffer associated with a central processing unit (CPU) that processes the I/O command, in response to generating the cache hit. The metadata track is asynchronously updated from the buffer with the stored update for the metadata track in the buffer.
    Type: Application
    Filed: September 5, 2017
    Publication date: March 7, 2019
    Inventors: Kyler A, Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • VALIDATION OF DATA WRITTEN VIA TWO DIFFERENT BUS INTERFACES TO A DUAL SERVER BASED STORAGE CONTROLLER
    Publication number: 20190073284
    Abstract: A first server of a storage controller is configured to communicate with a host via a first bus interface, and a second server of the storage controller is configured to communicate with the host via a second bus interface. Data is written from the host via the first bus interface to a cache of the first server and via the second bus interface to a non-volatile storage of the second server. The data stored in the cache of the first server is periodically compared to the data stored in the non-volatile storage of the second server.
    Type: Application
    Filed: September 5, 2017
    Publication date: March 7, 2019
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos