- Patent Title: Method, apparatus and computer readable medium for building multi-tier flash cache by using spare flash drives and clean user data is flushed from main flash cache to one of the spare flash drives that only stores the clean user data, wherein the main flash cache is configured as one or more pairs of flash drives and the one of the spare flash drives is allocated as single drive to secondary flash cache
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Application No.: US15954720Application Date: 2018-04-17
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Publication No.: US10860496B2Publication Date: 2020-12-08
- Inventor: Liam Li , Xinlei Xu , Jian Gao , Lifeng Yang , Ruiyong Jia , Yousheng Liu
- Applicant: EMC IP Holding Company
- Applicant Address: US MA Hopkinton
- Assignee: EMC IP Holding Company LLC
- Current Assignee: EMC IP Holding Company LLC
- Current Assignee Address: US MA Hopkinton
- Agency: BainwoodHuang
- Priority: CN201710250534 20170417
- Main IPC: G06F12/0897
- IPC: G06F12/0897 ; G06F12/122
Abstract:
A computer-implemented method for establishing a multi-tier flash cache using spare drives. The method includes, in response to receiving an I/O request, determining that there is no free page in a main cache. Having determined that there is no free page in the main cache, the method further includes establishing a secondary cache by selecting at least one spare drive from a plurality of spare drives, flushing data from a cold page in the main cache to the secondary cache, an access frequency of the cold page being lower than a predetermined threshold, and writing data related to the I/O request from a persistent storage device to the cold page.
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