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Storage systems implementing offset erasure code stripes

專利號
US11175986B1
公開日期
2021-11-16
申請人
International Business Machines Corporation（US NY Armonk）
發(fā)明人
John Stewart Best; Steven Robert Hetzler
IPC分類
G06F11/00; G06F11/10; G11B5/82; G11B7/24097; H03M13/15
技術領域
erasure,storage,strips,disk,optical,in,code,failure,stripe,disks
地域： NY NY Armonk

摘要

A computer-implemented method, according to one embodiment, includes: selecting strips from each storage unit for a given erasure code stripe such that the given erasure code stripe includes at most one strip from a high failure rate region of the respective storage unit, where each of the storage units include high and low failure rate regions. The selected strips are organized such that a number of each strip in the given erasure code stripe is offset from the remaining strips by an amount that is greater than a total number of strips in the high failure rate regions. The organized selected strips are further mapped to form the given erasure code stripe such that the high failure rate regions on each storage unit are mapped to one or more sequentially numbered strips, and the low failure rate regions are mapped to additional sequentially numbered strips.

說明書

The arrows that extend along each of the storage layers 402, 404, 406 also indicate the intended direction in which data are written to the tracks therein. For example, data may initially be written to a first track (e.g., track closest to the center of the optical disk 400) of storage layer 402, while subsequent data are written to tracks in storage layer 402 radially outwards from the center 412 of the optical disk 400. It should be noted that while the cross-sectional view of FIG. 4A makes it appear that data are only written to one side of the optical disk 400, the data are actually written to each of the tracks in a circular fashion, progressively working towards the outer diameter 410 of the optical disk 400, e.g., as illustrated by the circular arrows in FIG. 4C. In other words, the data encoding pattern for the optical disk 400 preferably follows a continuous, spiral path covering the entire storage layer 402 and extending from the innermost track to the outermost track.

權利要求

1
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