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A Scalable and Highly Configurable Cache-Aware Hybrid Flash Translation Layer

Jalil Boukhobza 1 Pierre Olivier 1 Stéphane Rubini 1 
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : This paper presents a cache-aware configurable hybrid flash translation layer (FTL), named CACH-FTL. It was designed based on the observation that most state-of-the-art flash-specific cache systems above FTLs flush groups of pages belonging to the same data block. CACH-FTL relies on this characteristic to optimize flash write operations placement, as large groups of pages are flushed to a block-mapped region, named BMR, whereas small groups are buffered into a page-mapped region, named PMR. Page group placement is based on a configurable threshold defining the limit under which it is more cost-effective to use page mapping (PMR) and wait for grouping more pages before flushing to the BMR. CACH-FTL is scalable in terms of mapping table size and flexible in terms of Input/Output (I/O) workload support. CACH-FTL performs very well, as the performance difference with the ideal page-mapped FTL is less than 15% in most cases and has a mean of 4% for the best CACH-FTL configurations, while using at least 78% less memory for table mapping storage on RAM.
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Submitted on : Monday, March 24, 2014 - 5:10:46 PM
Last modification on : Tuesday, May 31, 2022 - 10:44:03 AM

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Jalil Boukhobza, Pierre Olivier, Stéphane Rubini. A Scalable and Highly Configurable Cache-Aware Hybrid Flash Translation Layer. Computers, 2014, 3 (1), pp.36-57. ⟨10.3390/computers3010036⟩. ⟨hal-00965159⟩



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