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HFM: Hybrid File Mapping Algorithm for SSD Space Utilization |
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PP: 2251-2265 |
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Author(s) |
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Jaechun No,
Soo-Mi Choi,
Sung-Soon Park,
Cheol-Su Lim,
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Abstract |
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| Although the technology of flash memory is rapidly improving, SSD usage is still limited due to the high cost per storage
capacity. An alternative is to construct the hybrid structure where a small SSD partition is combined with the large HDD partition, to
expand the file system space to HDD storage capacity while exploiting the performance advantage of SSD. In such a hybrid structure,
increasing the space utilization of SSD partition is the critical aspect in generating high I/O performance. In this paper, we present HFM
(Hybrid File Mapping) that has been implemented for the hybrid file system integrated with SSD. HFM enables to divide SSD partition
into several, logical data sections with each composed of the different extent size. To minimize fragmentation overhead, HFM defines
three different ways of partitioning functions based on the extent size of each data section. Furthermore, file allocations on the extent
are performed on the partitioned unit (segment) of extents to reuse the remaining free space as much as possible. The experimental
result of HFM using three public benchmarks shows that HFM can be effective in increasing the usage of SSD partition and enables to
contribute to provide better I/O throughput. |
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