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首页> 外文会议>Symposium on Mass Storage Systems and Technologies >Cache, Cache Everywhere, Flushing All Hits Down The Sink: On Exclusivity in Multilevel, Hybrid Caches
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Cache, Cache Everywhere, Flushing All Hits Down The Sink: On Exclusivity in Multilevel, Hybrid Caches

机译：缓存，缓存到处都是，刷新所有点击宿者：在多级，混合缓存中的排他性

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摘要

Several multilevel storage systems have been designed over the past few years that utilize RAM and flash-based SSDs in concert to cache data resident in HDD-based primary storage. The low cost/GB and non-volatility of SSDs relative to RAM have encouraged storage system designers to adopt inclusivity (between RAM and SSD) in the caching hierarchy. However, in light of recent changes in hardware landscape, we believe that in the future, multilevel caches are invariably going to be hybrid caches where 1) all/most levels are physically collocated 2) the levels differ substantially only with respect to performance and not storage density, and 3) all levels are persistent. In this paper, we will investigate the design tradeoffs involved in building exclusive, persistent, direct-attached, multilevel storage caches. In doing so, we will first present a comparative evaluation of various techniques that have been proposed to achieve exclusivity in distributed storage caches in the context of a direct-attached, hybrid cache, and show the potential performance benefits of maintaining exclusivity. We will then investigate extensions to these demand-based, read-only data caching algorithms in order to address two issues specific to direct-attached hybrid caches, namely, handling writes and managing SSD lifetime.
机译：在过去几年中设计了几个多级存储系统，该系统在COMPERT中使用RAM和基于闪存的SSD来缓存数据库的基于硬盘的主要存储器中的数据。 SSD相对于RAM的低成本/ GB和非波动性鼓励存储系统设计人员在缓存层次结构中采用包含率（RAM和SSD之间）。但是，鉴于最近的硬件景观变化，我们认为，在将来，多级高速缓存总是会是混合缓存，其中1）所有/最级别都是物理地并置2），水平仅仅相对于性能而不同存储密度和3）所有级别都是持久的。在本文中，我们将调查建筑物独家，持久，直接，多级存储缓存所涉及的设计权衡。在这样做时，我们将首先提出对已经提出的各种技术的比较评估，这些技术在直接附加的混合缓存的上下文中达到了分布式储存缓存中的排他性，并显示了保持独特性的潜在性能益处。然后，我们将调查基于需求的只读数据缓存算法的扩展，以便解决特定于直接附加的混合缓存的两个问题，即处理写入并管理SSD生命周期。

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