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Title:
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IMPROVING SNAPSHOT PERFORMANCE BY SSD CONTROLLER IN ALL-FLASH ARRAY |
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Author(s):
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Miho Imazaki, Norio Shimozono and Norihisa Komoda |
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ISBN:
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978-989-8533-82-1 |
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Editors:
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Pedro Isaías and Hans Weghorn |
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Year:
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2018 |
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Edition:
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Single |
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Keywords:
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Storage System, All-Flash Array, Snapshot, SSD, Flash Translation Layer |
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Type:
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Full Paper |
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First Page:
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253 |
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Last Page:
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260 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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We propose an efficient snapshot method named Mapping Switching in Flash Translation Layer (MSiF), to resolve a performance problem in the traditional Copy on Write (CoW) method, for all-flash arrays with high-speed SSDs. Instead of physical data transfers by Storage Controller (SC), MSiF rewrites the SSDs logical-physical address translation table using Flash Translation Layer in SSDs. A difference occurs between current data and backup data due to an updating data, and a SC can overwrite the current data by switching a mapping of the logical-physical translation table in a SSD without physical data transfer. Therefore, the amount of data transfer to SSDs and paths in SCs decreases. We estimate the performance right after taking snapshots using an evaluation model; compared to CoW, MSiF reduce the time, which it takes to recover the temporary throughput degradation due to taking a snapshot, by up to 76.9%, and reduce the response time by up to 40.0%. |
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