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ROCO:Using a Solid State Drive Cache to Improve the Performance of a Host-Aware Shingled Magnetic Recording Drive
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作者 Wen-Guo Liu Ling-Fang Zeng +1 位作者 Dan Feng Kenneth B.Kent 《计算机科学技术学报:英文版》 SCIE EI CSCD 2019年第1期61-76,共16页
Shingled magnetic recording (SMR)can effectively increase the capacity of hard disk drives (HDDs).Hostaware SMR (HA-SMR)is expected to be more popular than other SMR models because of its backward compatibility and ne... Shingled magnetic recording (SMR)can effectively increase the capacity of hard disk drives (HDDs).Hostaware SMR (HA-SMR)is expected to be more popular than other SMR models because of its backward compatibility and new SMR-specific APIs.However,an HA-SMR drive often suffers performance degradation under write-intensive workloads because of frequent non-sequential writes buffered in the disk cache.The non-sequential writes mainly come from update writes,small random writes and out-of-order writes.In this paper,we propose a hybrid storage system called ROCO which aims to use a solid state drive (SSD)cache to improve the performance of an HA-SMR drive.ROCO reorders out-of-order writes belonging to the same zone and uses the SSD cache to absorb update writes and small random writes.We also design a data replacement algorithm called CREA for the SSD cache.CREA first conducts zone-oriented hot/cold data identification to identify cold-cached zones and hot-cached zones,and then evicts data blocks belonging to colder zones with higher priorities that can be sequentially written or written through host-side read-modify-write operations.It gives the lowest priority to data blocks belonging to the hottest-cached zone that have to be non-sequentially written.Experimental results show that ROCO can effectively reduce non-sequential writes to the HA-SMR drive and improve the performance of the HA-SMR drive. 展开更多
关键词 solid state reordering zone-oriented DRIVE (SSD)cache host-aware shingled magnetic recording (HA-SMR)drive zone-oriented block hot/cold DATA identification DATA replacement algorithm
十堰市城市发展模式研究 预览 被引量:1
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作者 李安均 《十堰职业技术学院学报》 2005年第2期 26-28,共3页
因历史及地形等因素影响,十堰市城市存在布局分散、功能性不强等问题.从可持续发展高度着眼,未来十堰市城市应依据自然地理条件和城市功能组织要求以带状多组团发展模式进行规划,在工业、居住及公共设施用地上统筹兼顾,建设具备十堰山... 因历史及地形等因素影响,十堰市城市存在布局分散、功能性不强等问题.从可持续发展高度着眼,未来十堰市城市应依据自然地理条件和城市功能组织要求以带状多组团发展模式进行规划,在工业、居住及公共设施用地上统筹兼顾,建设具备十堰山城特色的生态园林城. 展开更多
关键词 十堰市 城市布局 发展模式 带状组团式发展 生态园林城
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