METHOD AND SYSTEM FOR IMPROVING FLASH STORAGE UTILIZATION BY PREDICTING BAD M-PAGES
First Claim
1. A method for managing persistent storage, the method comprising:
- selecting a page for a proactive read request, wherein the page is located in the persistent storage;
issuing the proactive read request to the page;
receiving, in response to the proactive read request, a bit error value (BEV) for data stored on the page;
obtaining a BEV threshold (T) for the page, wherein T is determined using a program/erase cycle value associated with the page and a retention time of the data stored on the page;
making a first determination that the BEV is greater than T;
based on the first determination;
identifying an m-page, wherein the m-page is a set of pages, wherein the page is in the set of pages;
setting the m-page as non-allocatable for future operations.
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Accused Products
Abstract
A method for managing persistent storage. The method includes selecting a page for a proactive read request, where the page is located in the persistent storage. The method further includes issuing the proactive read request to the page, receiving, in response to the proactive read request, a bit error value (BEV) for data stored on the page, obtaining a BEV threshold (T) for the page, wherein T is determined using a program/erase cycle value associated with the page and a retention time of the data stored on the page, making a first determination that the BEV is greater than T, based on the first determination: identifying an m-page, where the m-page is a set of pages and the page is in the set of pages, and setting the m-page as non-allocatable for future operations.
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Citations
20 Claims
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1. A method for managing persistent storage, the method comprising:
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selecting a page for a proactive read request, wherein the page is located in the persistent storage; issuing the proactive read request to the page; receiving, in response to the proactive read request, a bit error value (BEV) for data stored on the page; obtaining a BEV threshold (T) for the page, wherein T is determined using a program/erase cycle value associated with the page and a retention time of the data stored on the page; making a first determination that the BEV is greater than T; based on the first determination; identifying an m-page, wherein the m-page is a set of pages, wherein the page is in the set of pages; setting the m-page as non-allocatable for future operations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system, comprising:
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a storage module comprising a storage module controller and persistent storage; and a control module operatively connected to the storage module and a client, wherein the control module performs the following steps; selecting a page for a proactive read request, wherein the page is located in the persistent storage; issuing the proactive read request to the page; receiving, in response to the proactive read request, a bit error value (BEV) for data stored on the page; obtaining a BEV threshold (T) for the page, wherein T is determined using a program/erase cycle value associated with the page and a retention time of the data stored on the page; making a first determination that the BEV is greater than T; based on the first determination; identifying an m-page, wherein the m-page is a set of pages, wherein the page is in the set of pages; and setting the m-page as non-allocatable for future operations. - View Dependent Claims (15, 16, 17, 18)
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19. The system of claim 19, wherein the third determination takes into account a BEV of at least one other page in the persistent storage, wherein the page and the at least one other page are part of a RAID stripe.
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20. A non-transitory computer readable medium comprising computer readable program code, which when executed by a computer processor enables the computer processor to:
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select a page for a proactive read request, wherein the page is located in the persistent storage; issue the proactive read request to the page; receive, in response to the proactive read request, a bit error value (BEV) for data stored on the page; obtain a BEV threshold (T) for the page, wherein T is determined using a program/erase cycle value associated with the page and a retention time of the data stored on the page; make a first determination that the BEV is greater than T; based on the first determination; identify an m-page, wherein the m-page is a set of pages, wherein the page is in the set of pages; and set the m-page as non-allocatable for future operations.
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Specification