使用固態硬碟之多媒體伺服器的省電儲存策略

Abstract

有鑑於近年來雲端風氣的興起及多媒體伺服器龐大的能源消耗，本論文藉由加入低耗電的固態硬碟設計出一套針對多媒體伺服器的省電儲存策略。此省電儲存策略會搭配一套降低儲存系統頻寬需求量的排程策略，藉由減少儲存系統的頻寬負荷量使得系統中硬碟可盡量進入休眠模式以節省整體多媒體伺服器之儲存系統的整體耗電量。在此省電儲存策略中，先以PDC為基準把大部分的熱門電影存放在少部分的硬碟中，接著透過適當的複製影片到硬碟及固態硬碟內使得不同儲存媒介可以同時存放熱門及不熱門的影片資料。如此一來，多媒體伺服器便可隨目前系統中之負載量調整進入休眠模式的硬碟數量以達到省電之目的。此外，此儲存省電策略並搭配使用批次等方法降低頻寬需求量的排程策略以降低系統中目前需耗電的磁碟數量。相較於傳統的PDC，本論文提出的方法在系統需求量較低時可節省約一倍的耗電量。

This paper is motivated by the tremendous energy consumption of streaming video servers and the energy-economic nature of solid-state drives. An energy-aware data placement strategy and its associated scheduling strategy is proposed for steaming video servers equipped with solid-state drives (SSDs). A skewed energy-aware load over SSDs and disks is adopted with a duplication policy to mix popular and unpopular video files so that disks could spin down as much as possible. With the concepts of batch processing and patching further integrated with the scheduling strategy, the proposed strategy could further reduce the bandwidth load and minimize the number of active disks.