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公开(公告)号:GB2491004B
公开(公告)日:2013-04-24
申请号:GB201207613
申请日:2012-05-02
Applicant: IBM
Inventor: SHMUELI EDI , GILL BINNY SHER , ASSAF NITZAN , LOTEM EYAL , BELLUOMINI WENDY ANN , HAFNER JAMES LEE , SMITH DANIEL FELIX , HETZLER STEVEN ROBERT , NAYAR GOPAL
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公开(公告)号:GB2491004A
公开(公告)日:2012-11-21
申请号:GB201207613
申请日:2012-05-02
Applicant: IBM
Inventor: SHMUELI EDI , GILL BINNY SHER , ASSAF NITZAN , LOTEM EYAL , BELLUOMINI WENDY ANN , HAFNER JAMES LEE , SMITH DANIEL FELIX , HETZLER STEVEN ROBERT , NAYAR GOPAL
Abstract: A storage system contains a controller 102, a flash memory 106 and another type of storage device, such as a hard disc drive 108. The flash memory has a life span based on the number of write/erase cycles for each block. The controller estimates the remaining lifespan of the flash memory. Based on the estimate, it determines which data should be written to the flash memory. A limit may be placed on the size of data transfer written to the flash memory. Data transfers over the limit are written to the other storage device without being written to the flash. A limit may be placed on the amount of data pre-fetched from the other storage device during read operations. A proportion of transfers to the system may be written directly to the other storage device and not to the flash memory.
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