发明名称 |
Roll-back log to provide data consistency |
摘要 |
A system or method for reestablishing data consistency between data volume P and its real time or near real time copy volume S. When volumes P and S enter a state of data inconsistency, data consistency can be restored through use of roll-back and/or roll-forward logs. The roll-forward log stores new data to be written to volume P. The roll-back log stores existing data of volume S before the existing data of volume S is overwritten with new data. As will be more fully described below, the roll-back log can be used to incrementally restore volume S to a prior data state in reverse chronological order, while a roll-forward log can be used to incrementally restore volume S in forward chronological to equal the data state of volume P.
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申请公布号 |
US7831782(B1) |
申请公布日期 |
2010.11.09 |
申请号 |
US20040881724 |
申请日期 |
2004.06.30 |
申请人 |
SYMANTEC OPERATING CORPORATION |
发明人 |
COULTER TIMOTHY R.;KRISHNAMURTHY RAGHU;BOTES PAR A. |
分类号 |
G06F12/00;G06F13/00;G06F13/28 |
主分类号 |
G06F12/00 |
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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