| US 7,613,785 B2 | ||
| Decreased response time for peer-to-peer remote copy write operation | ||
| James C. Chen, Tucson, Ariz. (US); Minh-Ngoc L. Huynh, San Jose, Calif. (US); Matthew J. Kalos, Tucson, Ariz. (US); and Chung M. Fung, San Francisco, Calif. (US) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Nov. 20, 2003, as Appl. No. 10/719,229. | ||
| Prior Publication US 2005/0114358 A1, May 26, 2005 | ||
| Int. Cl. G06F 7/00 (2006.01) | ||
| U.S. Cl. 709—212 [709/207; 709/201; 709/238; 709/224; 709/239; 711/165; 711/112; 711/156; 711/161; 711/162; 707/100] | 35 Claims |
| 1. A method for transferring data in a PPRC environment, comprising:
pre-allocating at least a first payload buffer in a secondary storage control unit;
pre-allocating at least a first data buffer in the secondary storage control unit;
issuing a first write command for the transfer of a first block of data from a primary storage control unit to the secondary
storage control unit;
packaging write control information with a fibre channel protocol (FCP) command within a first extended command descriptor
block (CDB);
transmitting the first extended CDB from the primary storage control unit to the secondary storage control unit; and
transmitting the first block of data from the primary storage control unit to the secondary storage control unit.
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