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).

  • Populating a second cache with tracks from a first cache when transferring management of the tracks from a first node to a second node
    Patent number: 10552324
    Abstract: Provided are a computer program product, system, and method for populating a second cache with tracks from a first cache when transferring management of the tracks from a first node to a second node. Management of a first group of tracks in the storage managed by the first node is transferred to the second node managing access to a second group of tracks in the storage. After the transferring the management of the tracks, the second node manages access to the first and second groups of tracks and caches accessed tracks from the first and second groups in the second cache of the second node. The second cache of the second node is populated with the tracks in a first cache of the first node.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: February 4, 2020
    Assignee: International Business Machines Corporation
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos, Brian A. Rinaldi
  • Management of data written via a bus interface to a storage controller during consistent copying of data
    Patent number: 10545688
    Abstract: Remote copy operations are performed to copy data from a primary storage controller to a secondary storage controller, wherein input/output (I/O) requests are received at the primary storage controller from a host both via a bus interface and a network interface while the remote copy operations are in progress, and wherein consistency groups are formed during the remote copy operations to copy the data consistently. Quiescing of I/O operations performed via the bus interface are performed while a current consistency group is being replaced by a next consistency group during the remote copy operations.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: January 28, 2020
    Assignee: International Business Machines Corporation
    Inventors: Matthew J. Ward, Matthew J. Kalos, Joshua J. Crawford, Carol S. Mellgren, Matthew R. Craig
  • Device reservation state synchronization in data mirroring
    Patent number: 10521147
    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: Grant
    Filed: November 30, 2017
    Date of Patent: December 31, 2019
    Assignee: International Business Machines Corporation
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Carol S. Mellgren, John G. Thompson
  • INVALIDATING CKD DATA TRACKS PRIOR TO UNPINNING
    Publication number: 20190370178
    Abstract: A method for invalidating a track of data on a storage drive in preparation to unpin the track is disclosed. In one embodiment, such a method includes invalidating certain metadata associated with a track of data residing on a storage drive of a storage system. The method further creates, in cache of the storage system, an invalid track image associated with the track. The method destages, from the cache, the invalid track image to the storage drive. Once the invalid track image is destaged, the method may unpin the track in cache, thereby enabling destages of the track from the cache to the storage drive going forward. A corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: June 2, 2018
    Publication date: December 5, 2019
    Applicant: International Business Machines Corporation
    Inventors: Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos, Kyler A. Anderson
  • Selective space reclamation of data storage memory employing heat and relocation metrics
    Patent number: 10482032
    Abstract: Space of a data storage memory of a data storage memory system is reclaimed by determining heat metrics of data stored in the data storage memory; determining relocation metrics related to relocation of the data within the data storage memory; determining utility metrics of the data relating the heat metrics to the relocation metrics for the data; and making the data whose utility metric fails a utility metric threshold, available for space reclamation.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: November 19, 2019
    Assignee: International Business Machines Corporation
    Inventors: Michael T. Benhase, Evangelos S. Eleftheriou, Lokesh M. Gupta, Robert Haas, Xiao Y. Hu, Matthew J. Kalos, Ioannis Koltsidas, Roman A. Pletka
  • POPULATING A SECOND CACHE WITH TRACKS FROM A FIRST CACHE WHEN TRANSFERRING MANAGEMENT OF THE TRACKS FROM A FIRST NODE TO A SECOND NODE
    Publication number: 20190347200
    Abstract: Provided are a computer program product, system, and method for populating a second cache with tracks from a first cache when transferring management of the tracks from a first node to a second node. Management of a first group of tracks in the storage managed by the first node is transferred to the second node managing access to a second group of tracks in the storage. After the transferring the management of the tracks, the second node manages access to the first and second groups of tracks and caches accessed tracks from the first and second groups in the second cache of the second node.
    Type: Application
    Filed: July 24, 2019
    Publication date: November 14, 2019
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos, Brian A. Rinaldi
  • SECURING EXCLUSIVE ACCESS TO A COPY OF A METADATA TRACK VIA A PROCESS WHILE THE METADATA TRACK IS HELD IN A SHARED MODE BY ANOTHER PROCESS
    Publication number: 20190332539
    Abstract: In response to determining, by a storage controller, that a first process is to perform a write operation, a customer data track in a cache is configured for exclusive access while waiting for the write operation on the customer data track to be performed by the first process. In response to configuring the customer data track for the exclusive access, a copy of a metadata track is generated, wherein the metadata track stores metadata information of the customer data track and is configured for shared access. The copy of the metadata track is configured to provide exclusive access to a second process to perform operations on the copy of the metadata track, wherein the first process is able to perform the write operation on the customer data track that causes the metadata track to be updated while the second process performs the operations on the copy of the metadata track.
    Type: Application
    Filed: July 10, 2019
    Publication date: October 31, 2019
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos, Beth A. Peterson
  • Read cache synchronization in data replication environments
    Patent number: 10437730
    Abstract: A method for synchronizing primary and secondary read cache in a data replication environment is disclosed. In one embodiment, such a method includes monitoring contents of a primary read cache at a primary site. The method periodically sends, from the primary site to a secondary site, information regarding the contents of the primary read cache, such as a list of storage elements cached in the primary read cache. In certain embodiments, the information also includes temperature information indicating how frequently the storage elements are accessed. The method uses, at the secondary site, the information to substantially synchronize a secondary read cache with the primary read cache. A corresponding system and computer program product are also disclosed herein.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: October 8, 2019
    Assignee: International Business Machines Corporation
    Inventors: Matthew J. Kalos, Peter G. Sutton, Harry M. Yudenfriend
  • SHARING ALIAS ADDRESSES AMONG LOGICAL DEVICES
    Publication number: 20190303015
    Abstract: Provided are a computer program product, system, and method for sharing alias addresses among logical devices for a control unit managing access by hosts to logical devices configured with capacity from attached physical devices. An alias management group of logical devices and alias addresses assigned to the logical devices is configured. A plurality of requests to establish an association of the host with a logical device and the alias addresses assigned to the logical devices in the alias management group are received from a host. Acknowledgment is made to the host that the association is established in response to determining that the host is assigned the logical devices and alias addresses of the logical devices in the alias management group. The host can use one available alias address assigned to any one of the logical devices to access any one of the logical devices indicated in the association.
    Type: Application
    Filed: June 19, 2019
    Publication date: October 3, 2019
    Inventors: Susan K. Candelaria, Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Dale F. Riedy, Richard A. Ripberger, Harry M. Yudenfriend
  • SHARING ALIAS ADDRESSES AMONG LOGICAL DEVICES
    Publication number: 20190286344
    Abstract: Provided are a computer program product, system, and method for sharing alias addresses among logical devices by a host accessing logical devices provisioned with a capacity from physical devices managed by a control unit. The host establishes with the control unit an association of logical devices and alias addresses assigned to the logical devices, wherein the alias addresses are associated with an alias management group. Alias address pool information is generated indicating each of the logical devices and their assigned alias addresses indicated in the association. The host uses from the alias address pool information any one of the alias addresses in the alias address pool information to access any of the logical devices associated with the same alias management group as the alias address.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Inventors: Susan K. Candelaria, Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Dale F. Riedy, Richard A. Ripberger, Harry M. Yudenfriend
  • Sharing alias addresses among logical devices
    Patent number: 10402123
    Abstract: Provided are a computer program product, system, and method for sharing alias addresses among logical devices for a control unit managing access by hosts to logical devices configured with capacity from attached physical devices. An alias management group of logical devices and alias addresses assigned to the logical devices is configured. A plurality of requests to establish an association of the host with a logical device and the alias addresses assigned to the logical devices in the alias management group are received from a host. Acknowledgment is made to the host that the association is established in response to determining that the host is assigned the logical devices and alias addresses of the logical devices in the alias management group. The host can use one available alias address assigned to any one of the logical devices to access any one of the logical devices indicated in the association.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: September 3, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Susan K. Candelaria, Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Dale F. Riedy, Richard A. Ripberger, Harry M. Yudenfriend
  • PERFORMING PREPROCESSING OPERATIONS IN ANTICIPATION OF LOG FILE WRITES
    Publication number: 20190258412
    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: Application
    Filed: April 30, 2019
    Publication date: August 22, 2019
    Inventors: Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • USING A DELAY TIMER TO DELAY CODE LOAD OPERATIONS TO PROCESS QUEUED WRITE REQUESTS
    Publication number: 20190258424
    Abstract: Provided are a computer program product, system, and method for using a delay timer to delay code load operations to process queued write requests. A code load is performed to a selected storage device in a storage array comprised of a plurality of the storage devices. Writes are queued to the storage array in a non-volatile storage while performing the code load. A determination is made as to whether the queued writes to the storage array exceed a threshold. A delay timer is started in response to determining that the queued writes to the storage array exceed the threshold. An additional code load is initiated to an additional selected storage device in the storage array in response to determining that the delay timer has expired. The additional code load is initiated to the additional selected storage device in response to determining that the queued writes are less than the threshold.
    Type: Application
    Filed: February 20, 2018
    Publication date: August 22, 2019
    Inventors: Brian A. Rinaldi, Clint A. Hardy, Samantha A. Utter, Kevin J. Ash, Karl A. Nielsen, Matthew J. Kalos
  • Securing exclusive access to a copy of a metadata track via a process while the metadata track is held in a shared mode by another process
    Patent number: 10387321
    Abstract: In response to determining, by a storage controller, that a first process is to perform a write operation, a customer data track in a cache is configured for exclusive access while waiting for the write operation on the customer data track to be performed by the first process. In response to configuring the customer data track for the exclusive access, a copy of a metadata track is generated, wherein the metadata track stores metadata information of the customer data track and is configured for shared access. The copy of the metadata track is configured to provide exclusive access to a second process to perform operations on the copy of the metadata track, wherein the first process is able to perform the write operation on the customer data track that causes the metadata track to be updated while the second process performs the operations on the copy of the metadata track.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: August 20, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos, Beth A. Peterson
  • Using an access increment number to control a duration during which tracks remain in cache
    Patent number: 10380035
    Abstract: Provided are a computer program product, system, and method for using an access increment number to control a duration during which tracks remain in cache. Tracks in a storage in the cache are indicated in a cache list. For each of the tracks indicated in the cache list, an access value is updated when one of the tracks is accessed in the cache. An access to a track in the cache indicated in the cache list is received. A determination is made as to whether an access increment number for the accessed track, wherein the access increment number is greater than one. The access value for the accessed track is incremented by the determined access increment number in response to the track being accessed in the cache. The access value for one of the tracks is used to determine whether to initiate to demote the track from the cache.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: August 13, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos
  • PRESERVATION OF MODIFIED CACHE DATA IN LOCAL NON-VOLATILE STORAGE FOLLOWING A FAILOVER
    Publication number: 20190236014
    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: Application
    Filed: April 9, 2019
    Publication date: August 1, 2019
    Inventors: Kyler A. Anderson, Kevin J. Ash, Lokesh M. Gupta, Matthew J. Kalos
  • DEVICE RESERVATION STATE PRESERVATION IN DATA MIRRORING
    Publication number: 20190220370
    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: March 26, 2019
    Publication date: July 18, 2019
    Inventors: Scott B. Compton, Matthew R. Craig, Clint A. Hardy, Matthew J. Kalos, Carol S. Mellgren, John G. Thompson
  • POPULATING A SECONDARY CACHE WITH UNMODIFIED TRACKS IN A PRIMARY CACHE WHEN REDIRECTING HOST ACCESS FROM A PRIMARY SERVER TO A SECONDARY SERVER
    Publication number: 20190222669
    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: Application
    Filed: March 25, 2019
    Publication date: July 18, 2019
    Inventors: Kevin J. Ash, Matthew G. Borlick, Lokesh M. Gupta, Matthew J. Kalos, Brian A. Rinaldi
  • MANAGEMENT OF DATA WRITTEN VIA A BUS INTERFACE TO A STORAGE CONTROLLER DURING CONSISTENT COPYING OF DATA
    Publication number: 20190212925
    Abstract: Remote copy operations are performed to copy data from a primary storage controller to a secondary storage controller, wherein input/output (I/O) requests are received at the primary storage controller from a host both via a bus interface and a network interface while the remote copy operations are in progress, and wherein consistency groups are formed during the remote copy operations to copy the data consistently. Quiescing of I/O operations performed via the bus interface are performed while a current consistency group is being replaced by a next consistency group during the remote copy operations.
    Type: Application
    Filed: January 11, 2018
    Publication date: July 11, 2019
    Inventors: Matthew J. Ward, Matthew J. Kalos, Joshua J. Crawford, Carol S. Mellgren, Matthew R. Craig
  • SIDEFILES FOR MANAGEMENT OF DATA WRITTEN VIA A BUS INTERFACE TO A STORAGE CONTROLLER DURING CONSISTENT COPYING OF DATA
    Publication number: 20190212924
    Abstract: Remote copy operations are performed to copy data from a primary storage controller to a secondary storage controller, wherein input/output (I/O) requests are received at the primary storage controller from a host both via a bus interface and a network interface while the remote copy operations are in progress, and wherein consistency groups are formed during the remote copy operations to copy the data consistently. A relocation is performed of data written via the bus interface for a current consistency group from a cache to a sidefile, and subsequently data written via the bus interface for a next consistency group is stored in the cache.
    Type: Application
    Filed: January 11, 2018
    Publication date: July 11, 2019
    Inventors: Matthew J. Ward, Matthew J. Kalos, Joshua J. Crawford, Carol S. Mellgren