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Storage"],"published-print":{"date-parts":[[2018,5,31]]},"abstract":"<jats:p>Since little has been reported in the literature concerning enterprise storage system file-level request scheduling, we do not have enough knowledge about how various scheduling factors affect performance. Moreover, we are in lack of a good understanding on how to enhance request scheduling to adapt to the changing characteristics of workloads and hardware resources. To answer these questions, we first build a request scheduler prototype based on WAFL\u00ae, a mainstream file system running on numerous enterprise storage systems worldwide. Next, we use the prototype to quantitatively measure the impact of various scheduling configurations on performance on a NetApp\u00ae's enterprise-class storage system. Several observations have been made. For example, we discover that in order to improve performance, the priority of write requests and non-preempted restarted requests should be boosted in some workloads. Inspired by these observations, we further propose two scheduling enhancement heuristics called SORD (size-oriented request dispatching) and QATS (queue-depth aware time slicing). Finally, we evaluate them by conducting a wide range of experiments using workloads generated by SPC-1 and SFS2014 on both HDD-based and all-flash platforms. Experimental results show that the combination of the two can noticeably reduce average request latency under some workloads.<\/jats:p>","DOI":"10.1145\/3193741","type":"journal-article","created":{"date-parts":[[2018,4,27]],"date-time":"2018-04-27T16:00:21Z","timestamp":1524844821000},"page":"1-27","update-policy":"https:\/\/2.zoppoz.workers.dev:443\/https\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Empirical Evaluation and Enhancement of Enterprise Storage System Request Scheduling"],"prefix":"10.1145","volume":"14","author":[{"given":"Deng","family":"Zhou","sequence":"first","affiliation":[{"name":"San Diego State University, San Diego, CA, USA"}]},{"given":"Vania","family":"Fang","sequence":"additional","affiliation":[{"name":"NetApp, Inc., Sunnyvale, CA, USA"}]},{"given":"Tao","family":"Xie","sequence":"additional","affiliation":[{"name":"San Diego State University, San Diego, CA, USA"}]},{"given":"Wen","family":"Pan","sequence":"additional","affiliation":[{"name":"San Diego State University, San Diego, CA, USA"}]},{"given":"Ram","family":"Kesavan","sequence":"additional","affiliation":[{"name":"NetApp, Inc., Sunnyvale, CA, USA"}]},{"given":"Tony","family":"Lin","sequence":"additional","affiliation":[{"name":"NetApp, Inc., Sunnyvale, CA, USA"}]},{"given":"Naresh","family":"Patel","sequence":"additional","affiliation":[{"name":"NetApp, Inc., Sunnyvale, CA, USA"}]}],"member":"320","published-online":{"date-parts":[[2018,4,27]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"2015. 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