发明名称 |
STORAGE SYSTEM AND STORAGE AREA ALLOCATION METHOD |
摘要 |
<p>If a monitor measurement cycle is set as a long cycle, promotion in a short cycle cannot be performed; and even if the number of I/Os is very large in response to fluctuations of the number of I/Os in several minutes to several hours of normal work, pages will be promoted after waiting for several weeks. As a result, I/Os which could have normally accepted by an upper tier will be accepted by a lower tier, which results in a problem of worsening the performance efficiency. A monitoring system capable of preventing demotion due to temporary reduction of the number of I/Os for specific pages from a viewpoint of a long cycle and enabling prompt promotion in response to an increase of the number of U/Os for 3 the specific pages is realized. A load index value defined from a viewpoint of a long cycle and a load index value defined from a viewpoint of a short cycle are updated based on the number of I/Os which is counted cyclically for each storage area. Promotion and demotion are implemented based on a value(s) calculated from these load index values.</p> |
申请公布号 |
EP2633386(A1) |
申请公布日期 |
2013.09.04 |
申请号 |
EP20110718508 |
申请日期 |
2011.03.25 |
申请人 |
HITACHI, LTD. |
发明人 |
AKUTSU, HIROAKI;OHIRA, YOSHINORI;EGUCHI, YOSHIAKI;YAMAMOTO, MASAYUKI |
分类号 |
G06F3/06 |
主分类号 |
G06F3/06 |
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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