发明名称 |
Maintaining data consistency in mirrored cluster storage systems with write-back cache |
摘要 |
Techniques for maintaining mirrored storage cluster data consistency on systems with write back cache can employ write-intent logging and periodic log clearing. The techniques can track any outstanding I/Os, data in caches, and data that has gone out of sync between mirrored nodes due to link failures. The techniques can ensure that a power failure on any of the storage nodes does not result in inconsistent data among the storage nodes. The techniques can use gate bitmaps to log outstanding I/Os. The gate bitmaps may be periodically cleared. The clearing period may be selected as to allow enough time for all caches to be flushed and for all synchronizing I/Os to complete. Efficient queuing of I/O requests in conjunction with the efficient operation of multiple gate bitmaps can reduce performance impacts of the gating or logging operations. |
申请公布号 |
US8244999(B1) |
申请公布日期 |
2012.08.14 |
申请号 |
US201113046857 |
申请日期 |
2011.03.14 |
申请人 |
CHATTERJEE PARESH;BALAKRISHNAN NARAYANAN;JAYARAMAN RAJA;AMERICAN MEGATRENDS, INC. |
发明人 |
CHATTERJEE PARESH;BALAKRISHNAN NARAYANAN;JAYARAMAN RAJA |
分类号 |
G06F13/00;G06F7/00;G06F13/28;G06F17/00 |
主分类号 |
G06F13/00 |
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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