Hybrot: Towards Improved Performance in Hybrid SLC-MLC Devices
Hybrot: Towards Improved Performance in Hybrid SLC-MLC Devices
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DOI：
10.1109/mascots.2012.60
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
M. Murugan;D. Du
中科院分区：
文献类型：
--
作者：
M. Murugan;D. Du
有两种类型的NAND闪存- MLC（多级单元）和SLC（单级单元）。MLC NAND闪存的低耐久性和较慢的写入性能限制了其在大规模固态驱动器中的使用。另一方面，SLC NAND闪存具有更高的耐久性和更快的写入性能，比MLC设备昂贵得多。混合SLC-MLC器件通过以低成本提供改进的可靠性来弥合两者之间的差距。在本文中，我们提出了一种高效的架构称为Hybrot，旨在提供更好的性能在混合SLC - MLC设备，并在同一时间确保最大的寿命闪存块。我们提出了一个灰盒的方法来管理SLC和MLC块，实现了目标的写入性能，无论底层闪存管理算法。
There are two types of NAND flash memory - MLC (Multi -- Level Cell) and SLC (Single -- Level Cell). Low endurance and slower write performance in MLC NAND flash memory is a limitation to its usage in large scale solid state drives. On the other hand SLC NAND flash memory which has higher endurance and faster write performance is much more expensive than MLC devices. Hybrid SLC-MLC devices bridge the gap between the two by providing improved reliability at a low cost. In this paper, we propose an efficient architecture called Hybrot that aims at providing improved performance in hybrid SLC -- MLC devices and at the same time ensures maximum lifetime for the flash blocks. We propose a gray box approach for managing the SLC and MLC blocks which achieves the target write performance irrespective of the underlying flash management algorithms.