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Emerging <i>non-volatile main memories</i> (NVMMs) provide data persistence at the main memory level. To avoid the double-copy overheads among the user buffer, the OS page cache, and the storage layer, state-of-the-art NVMM-aware file systems bypass the OS page cache which directly copy data between the user buffer and the NVMM storage. However, one major(More)
Data migration schemes are critical to balance the load in storage clusters for performance improvement. However, as NAND flash based SSDs are widely deployed in storage systems, extending the lifespan of SSD storage clusters becomes a new challenge for data migration. Prior approaches designed for HDD storage clusters, however, are inefficient due to(More)
Modern applications have their own update protocols to remain failure consistency. However, these protocols are implemented without a comprehensive understanding of the persistence properties of the underlying file systems and typically optimized for disk-based storage. As a result, they are complex, error-prone, and exhibit disappointing performance on(More)
Distributed metadata service is important for metadata intensive applications. Unfortunately, it leads to cross-server file operation, and maintaining the consistency of cross-server file operation creates a performance challenge because of sequentially executed sub-operations and costly immediate commitment among servers. In this paper, we observe that(More)
SSD-based RAID arrays have been widely adopted in large-scale systems. One requirement on a RAID is to provide data consistency, which can be an issue during serving write requests. While using NVRAM or on-storage logging can ensure the consistency, the approaches can either be very expensive or substantially compromise performance. For SSD-based RAID,(More)
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