[특허]Quick recovery of write cache in a fault tolerant I/O system

Quick recovery of write cache in a fault tolerant I/O system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-012/10 G06F-013/14
출원번호	US-0626245 (1996-03-29)
발명자 / 주소	Dewey Matthew C. Jones Ellen F.
출원인 / 주소	EMC Corporation
대리인 / 주소	Kubida
인용정보	피인용 횟수 : 111 인용 특허 : 0

초록 ▼

A method for recovering data from a cache memory of a second storage controller by access to a cache memory of a first storage controller is presented. The storage controllers are coupled by a private common data path. The method includes copying metadata corresponding to the data stored in the cache memory of the second storage controller to the cache memory of the first storage controller through the private common data path. The metadata may include pointers to and the size of the data. After copying the metadata pointers, the data in the cache memory of the second storage controller is established in the cache memory of the first storage controller. As a result, the entire set of data does not need to be totally recovered to the hard disk before resuming host communications in a recovery operation, which may take a relatively long time. Instead, if a controller fails, only a portion of the data in the cache of the failed controller, the data describing the recovery information, needs to be incorporated into the "dirty" cache of the remaining controller before communications with the host are resumed.

대표청구항 ▼

[ We claim:] [3.] A computer system comprising:at least one host computer;a plurality of storage controllers coupled to said at least one host computer, at least one subset of said plurality of storage controllers being coupled together through at least one data path, each of said at least one subset of said plurality of storage controllers having a local cache memory for storing respective data and associated metadata;at least one data storage unit coupled to a computer mass storage bus coupling said at least one subset of said plurality of storage controllers;whereby said metadata from said cache memory of a second one of said subset of said plurality of storage controllers may be copied to said cache memory of a first one of said subset of said plurality of storage controllers through said at least one host computer for access to selected portions of said data stored in said cache memory of said second one of said plurality of storage controllers by reference to said metadata copied from said second storage controller cache memory.

이 특허를 인용한 특허 (111)

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Quick recovery of write cache in a fault tolerant I/O system 원문보기

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Quick recovery of write cache in a fault tolerant I/O system 원문보기

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