Electrical computers and digital processing systems: multicomput – Computer-to-computer direct memory accessing
Reexamination Certificate
2003-11-20
2009-11-03
Jean Gilles, Jude J (Department: 2443)
Electrical computers and digital processing systems: multicomput
Computer-to-computer direct memory accessing
C709S207000, C709S201000, C709S238000, C709S224000, C709S239000, C711S165000, C711S112000, C711S156000, C711S161000, C711S162000, C707S793000
Reexamination Certificate
active
07613785
ABSTRACT:
Methods, system and computer program product are provided to improve the efficiency of data transfers in a PPRC environment. Any or all of three features may be implemented, each of which reduces the number of round trips required for the exchange of handshaking, data and control information. A first feature includes disabling the “transfer ready” acknowledgment which normally occurs between a primary storage controller and a secondary storage controller. A second feature includes pre-allocating payload and data buffers in the secondary storage controller. A third feature includes packaging write control information with a write command in an extended command descriptor block (CDB). Such a step eliminated the need for a separate transmission of the write control information. The CDB is transmitted along with a data block from the primary storage controller to the secondary storage controller and placed in the respective, pre-allocated buffers. Data may also be pipelined to the secondary. By decreasing the response time for data transfers, the distance separating the primary and secondary storage controllers may be increased.
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Chen James C.
Fung Chung M.
Huynh Minh-Ngoc L.
Kalos Matthew J.
Gilles Jude J Jean
International Business Machines - Corporation
Shifrin Dan
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