Patents by Inventor Ross Zwisler

Ross Zwisler 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).

  • Patent number: 9170740
    Abstract: The present invention is a system and method which allows for a VTL system that supports thin provisioning to implicitly unmap unused storage. Such unmap operations may occur even though the VTL system does not receive any explicit unmap requests from its initiators. For example, if a system administrator knows that once a virtual tape drive of the VTL system has been partially overwritten, all previously written data sets on that virtual tape drive will never again be accessed, the system administrator may configure the VTL system so that it unmaps the entire remainder of the virtual tape drive on the first data overwrite.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: October 27, 2015
    Assignee: NetApp, Inc.
    Inventors: Ross Zwisler, Brian McKean, Kevin Kidney
  • Patent number: 8527718
    Abstract: A method for communication between an initiator system and a block storage cluster may include receiving a first command at a first storage system included in a plurality of storage systems of the block storage cluster. The method may also include transmitting a referral response from the first storage system to the initiator system when at least a portion of the data associated in the first command is stored by a second storage system. The method may further include obtaining a segment start value and a corresponding port identifier based on the referral response, and directing a second command to at least a second storage system included in the plurality of storage systems of the block cluster.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: September 3, 2013
    Assignee: LSI Corporation
    Inventors: Ross Zwisler, Andrew J. Spry, Gerald J. Fredin, Kenneth J. Gibson
  • Patent number: 8495348
    Abstract: A system and method for root booting includes a plurality of computing devices that each boot from a read-only base volume of an attached storage device that includes data common to the computing devices. The attached storage device also includes a plurality of volumes, each dedicated to one of the computing devices, which are redirect on write snapshots of the read-only base volume including unique items for the respective computing device. The read-only base volume may be stored in one or more solid state drives which may be configured as a RAID (redundant array of independent disks) and/or mirrored with one or more other storage drives. The plurality of volumes may each be stored in one or more hard disk drives which may be configured as a RAID. The attached storage device may be operable to add common data to the read-only base volume.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: July 23, 2013
    Assignee: LSI Corporation
    Inventors: Ross Zwisler, Brian McKean
  • Patent number: 8332549
    Abstract: A method for communication between an initiator system and a block storage cluster may include receiving a first input/output (I/O) request from the initiator system. The method may also include sending a referral response from a first storage system included in a plurality of storage systems of the block storage cluster to the initiator system when data associated with the first I/O request is stored in more than one storage system of the plurality of storage systems of the block storage cluster. Additionally, the method may include directing a referral I/O to the first storage system and the second storage system for transferring data to or transferring data from the first storage system and the second storage system, and transferring data associated with the referral I/O to or transferring data associated with the referral I/O from the first storage system and the second storage system.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: December 11, 2012
    Assignee: LSI Corporation
    Inventors: Andrew J. Spry, Ross Zwisler, Gerald J. Fredin, Kenneth J. Gibson
  • Patent number: 8201001
    Abstract: The present invention is a method for drive management and data placement in an archival storage system having a set of drives. The method includes mapping redundant data stripes onto the drives. A first active data stripe, located on a first subset of the drives, is then selected from the mapped data stripes. The first subset is placed into a normal power state and a second subset of the drives is placed into a low power state. Data is then written to the first active data stripe. Before the first active data stripe is fully used, the method includes selecting a next active/second active data stripe from the mapped data stripes, the second active data stripe being at least partially located on the second subset. The method may be performed by a system which implements MAID techniques for drive management and CRUSH for data placement.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: June 12, 2012
    Assignee: LSI Corporation
    Inventors: Brian McKean, Kevin Kidney, Ross Zwisler
  • Publication number: 20120036321
    Abstract: The present invention is a system and method which allows for a VTL system that supports thin provisioning to implicitly unmap unused storage. Such unmap operations may occur even though the VTL system does not receive any explicit unmap requests from its initiators. For example, if a system administrator knows that once a virtual tape drive of the VTL system has been partially overwritten, all previously written data sets on that virtual tape drive will never again be accessed, the system administrator may configure the VTL system so that it unmaps the entire remainder of the virtual tape drive on the first data overwrite.
    Type: Application
    Filed: August 6, 2010
    Publication date: February 9, 2012
    Applicant: LSI CORPORATION
    Inventors: Ross Zwisler, Brian McKean, Kevin Kidney
  • Publication number: 20110035547
    Abstract: The present invention is a method for utilizing mirroring in a data storage system to promote improved data accessibility and improved system efficiency. The method includes establishing a first set of drives of the system in active mode and a second set of drives of the system in passive mode (ex.—a lower power mode). The method further includes writing a first portion of data to a first drive of the first drive set, and writing a copy of the first portion of data to a second drive of the first drive set. A third drive (ex.—from the second drive set), may be activated from passive mode to active mode. The method may further include writing a second copy of the first data portion to the third drive, re-establishing the third drive in passive mode, and deleting the copy of the first data portion from the second drive.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 10, 2011
    Inventors: Kevin Kidney, Brian D. McKean, Ross Zwisler
  • Publication number: 20110035605
    Abstract: The present invention is a method for drive management and data placement in an archival storage system having a set of drives. The method includes mapping redundant data stripes onto the drives. A first active data stripe, located on a first subset of the drives, is then selected from the mapped data stripes. The first subset is placed into a normal power state and a second subset of the drives is placed into a low power state. Data is then written to the first active data stripe. Before the first active data stripe is fully used, the method includes selecting a next active/second active data stripe from the mapped data stripes, the second active data stripe being at least partially located on the second subset. The method may be performed by a system which implements MAID techniques for drive management and CRUSH for data placement.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 10, 2011
    Inventors: Brian McKean, Kevin Kidney, Ross Zwisler
  • Publication number: 20100250894
    Abstract: A method for communication between an initiator system and a block storage cluster may include receiving a first command at a first storage system included in a plurality of storage systems of the block storage cluster. The method may also include transmitting a referral response from the first storage system to the initiator system when at least a portion of the data associated in the first command is stored by a second storage system. The method may further include obtaining a segment start value and a corresponding port identifier based on the referral response, and directing a second command to at least a second storage system included in the plurality of storage systems of the block cluster.
    Type: Application
    Filed: March 31, 2009
    Publication date: September 30, 2010
    Inventors: Ross Zwisler, Andrew J. Spry, Gerald J. Fredin, Kenneth J. Gibson
  • Publication number: 20100250795
    Abstract: A method for communication between an initiator system and a block storage cluster may include receiving a first input/output (I/O) request from the initiator system. The method may also include sending a referral response from a first storage system included in a plurality of storage systems of the block storage cluster to the initiator system when data associated with the first I/O request is stored in more than one storage system of the plurality of storage systems of the block storage cluster. Additionally, the method may include directing a referral I/O to the first storage system and the second storage system for transferring data to or transferring data from the first storage system and the second storage system, and transferring data associated with the referral I/O to or transferring data associated with the referral I/O from the first storage system and the second storage system.
    Type: Application
    Filed: March 31, 2009
    Publication date: September 30, 2010
    Inventors: Andew J. Spry, Ross Zwisler, Gerald J. Fredin, Kenneth J. Gibson
  • Publication number: 20100100677
    Abstract: The present invention is a method for storing data. The method includes the step of dividing data into a plurality of uniformly-sized segments. The method further includes storing said uniformly-sized segments on a plurality of storage mechanisms. The method includes the steps of monitoring access to the uniformly-sized segments stored on the plurality of storage mechanisms to determine an access pattern; monitoring access patterns between the plurality of disks and monitoring performance characteristics of the plurality of storage mechanisms to determine a performance requirement for the plurality of storage mechanisms. Finally, the method includes the step of migrating at least one segment of the plurality of uniformly-sized segments from a first storage mechanism of the plurality of storage mechanisms to a second storage mechanism of the plurality of storage mechanisms in response to at least one of the access patterns or the performance requirements.
    Type: Application
    Filed: October 16, 2008
    Publication date: April 22, 2010
    Inventors: Brian McKean, Ross Zwisler
  • Publication number: 20090327685
    Abstract: A system and method for root booting includes a plurality of computing devices that each boot from a read-only base volume of an attached storage device that includes data common to the computing devices. The attached storage device also includes a plurality of volumes, each dedicated to one of the computing devices, which are redirect on write snapshots of the read-only base volume including unique items for the respective computing device. The read-only base volume may be stored in one or more solid state drives which may be configured as a RAID (redundant array of independent disks) and/or mirrored with one or more other storage drives. The plurality of volumes may each be stored in one or more hard disk drives which may be configured as a RAID. The attached storage device may be operable to add common data to the read-only base volume.
    Type: Application
    Filed: June 26, 2008
    Publication date: December 31, 2009
    Inventors: Ross Zwisler, Brian McKean
  • Publication number: 20060020720
    Abstract: A system and method for communication amongst a device and multiple controllers. A controller may use a direct communication path to the device or may route the communication to another controller that has a faster communication path to the device. Such a system and method is particularly useful when the device takes a long time to switch from a communication path with the second controller to a communication path with the first controller.
    Type: Application
    Filed: July 23, 2004
    Publication date: January 26, 2006
    Applicant: LSI Logic Corporation
    Inventors: David Stallmo, Brian McKean, Ross Zwisler