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Flash-based solid state drive (SSD) is now widely deployed to speed up data intensive applications. However, I/O amplifications caused by file system metadata and journaling shorten the lifetime of SSD. In this paper, a mechanism named Persistent In-memory Metadata Management (referred to as PIMM) is proposed to reduce I/O traffics to SSD by exploiting the persistency and byte-addressability of Non-volatile...
The non-volatile memory (NVM) which can provide DRAM-like performance and disk-like persistency has the potential to build single-level systems by replacing both DRAM and disk. Keeping data consistency in such systems is non-trivial because memory writes may be reordered by CPU. Although ordered memory writes for achieving data consistency can be implemented using the memory fence and the CPU cache...
File system performance is dominated by metadata access because it is small and popular. Metadata is stored as block in the file system. Partial metadata update results in whole block read and write which amplifies disk I/O. Huge performance gap between CPU and disk aggravates this problem. In this paper, a file system metadata accelerator (referred as FSMAC) is proposed to optimize metadata access...
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