发明名称 |
Cache system for disk array. |
摘要 |
A cache system for staging data between host memory and a disk array comprising a plurality of disk storage devices plus associated controller unit, data being storable across the disks of the array in the form of strides, each stride comprising a multi-sector 'stripe' of data on each of two or more devices of the array and an associated multi-sector parity block on a further array device. The cache system includes means for linking the data and associated parity making up a stride within the cache as a cache data unit which is manipulated in the cache as a single entity. References from the host to data held within the cache causes the referenced cache unit to move to the head of a list of cache units. When a cache unit at the bottom of the list is committed to disk, there is an increased likelihood that most or all the data making up a stride will be in the cache and therefore the number of redundant accesses to the disk needed to generate parity data will be reduced or eliminated. <IMAGE> |
申请公布号 |
GB2273798(A) |
申请公布日期 |
1994.06.29 |
申请号 |
GB19920026725 |
申请日期 |
1992.12.22 |
申请人 |
* INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CLIVE SCOTT * OLDFIELD;NICHOLAS * SHAYLOR |
分类号 |
G06F3/06;G06F11/10;G06F12/08;G06F12/16;(IPC1-7):G06F12/08 |
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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