Patents Assigned to SANgate Systems, Inc.
  • Patent number: 6636908
    Abstract: A device, system and methods of data management are disclosed, which facilitate the implementation of improved mirroring, back-up, volume remapping, extent relocation, prefetching, caching, data reformatting, statistic gathering, and data translation, among others. A new, intelligent I/O stream splitter is disclosed that may intercept and alter an I/O stream received by the splitter from a communications link. For example, in the case of mirroring, the intelligent splitter may intercept write commands and associated data from a mainframe that target a specific storage location on a specific control unit. The splitter may then transmit the intercepted I/O stream to the targeted control unit and storage location over one link and in parallel transmit on another link an altered version of the intercepted I/O stream to another control unit, which is responsible for holding a mirrored version of the data.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: October 21, 2003
    Assignee: SANgate Systems, Inc.
    Inventors: Alexander Winokur, Seweryn Mokryn, Marek Mokryn
  • Patent number: 6625704
    Abstract: A method of creating a snapshot copy of data stored on a first direct access storage device is described. It includes the acts of receiving information identifying a set of data that is to be copied from the first direct access storage device and mapping destination locations in a second direct access storage device for each element of the set. The destination locations are in a sequence emulating a tape copy. The method also includes the acts of iterating through the set of data. For the each element of the set, the method of the present invention also includes the acts of determining if the element has already been copied to the second direct access storage device, and, if the element has not already been copied, then copying the element to its mapped location in the second direct access storage device. A corresponding system is also described.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: September 23, 2003
    Assignee: SANgate Systems, Inc.
    Inventor: Alexander Winokur
  • Publication number: 20020029281
    Abstract: The present invention combines IP multicasting mechanisms with SCSI protocols to achieve a more efficient data replication or data mirroring scheme. The combination of the IP multicast mechanism with the mapping of virtual unit logical number to real logical unit numbers, combined with the use of SCSI response frames, ensures the integrity of multicasted data. By use of the SCSI protocol over the TCP/IP according to the present invention, there is no further need to transfer multiple copies of the same data on the same communication link, and the routing logic may be removed from initiator and targets to IP routers.
    Type: Application
    Filed: May 23, 2001
    Publication date: March 7, 2002
    Applicant: SANgate Systems Inc.
    Inventors: Efraim Zeidner, Alexander Winokur