发明名称 |
External storage control device and data transfer method between external storage control devices |
摘要 |
In a data processing system in which main and sub disk storage devices are under the control of individual each disk control devices, the write processing time is reduced by selectively sending data according to the command-chaining time between main and sub disk control devices. A section for judging cable length and function of the sub disk control device 36 estimates command-chaining time between a pair of main and sub disk storage devices. The channel command analyzing section 31 estimates the number of records to be transferred and the length of a record using a LOCATE RECORD command. The command judgment section for the sub disk control device 32 optimizes the command-chain to be issued to the sub disk control device using the above-mentioned information. Then, the section for issuing command to the sub disk control device 35 issues the optimized command chain. Thus, a shorter transmission time is realized by either sending individual records or an entire track of data.
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申请公布号 |
US6321292(B1) |
申请公布日期 |
2001.11.20 |
申请号 |
US19990375357 |
申请日期 |
1999.08.17 |
申请人 |
HITACHI, LTD. |
发明人 |
OZAWA KOJI;SANO KAZUHIDE;KOIDE TAKESHI;NAKAMURA KATSUNORI |
分类号 |
G06F13/10;G06F3/06;G06F12/16;G06F13/12;(IPC1-7):G06F12/00 |
主分类号 |
G06F13/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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