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Improving Flash Resource Utilization at Minimal Management Cost in Virtualized Flash-Based Storage Systems

机译：在基于虚拟化的闪存存储系统中以最低的管理成本提高闪存资源的利用率

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摘要

Effectively leveraging Flash resources has emerged as a highly important problem in enterprise storage systems. One of the popular techniques today is to use Flash as a secondary-level host-side cache in the virtual machine environment. Although this approach delivers IO acceleration for VMs’ IO workloads, it might not be able to fully exploit the outstanding performance of Flash and justify the high cost-per-GB of Flash resources. In this paper, we design new VMware Flash Resource Managers (vFRM and glb-vFRM) under the consideration of both performance and the incurred cost for managing Flash resources. Specifically, vFRM and glb-vFRM aim to maximize the utilization of Flash resources with minimal CPU, memory and IO cost in managing and operating Flash for a dedicated enterprise workload and multiple heterogeneous enterprise workloads, respectively. Our new Flash resource managers adopt the ideas of thermodynamic heating and cooling to identify data blocks that can benefit the most from being put on Flash and migrate data blocks between Flash and magnetic disks in a lazy and asynchronous mode. Experimental evaluation of the prototype shows that both vFRM and glb-vFRM achieve better cost-effectiveness than traditional caching solutions, i.e., obtaining IO hit ratios even slightly better than some of the conventional algorithms as Flash size increases yet costing orders of magnitude less IO bandwidth.
机译：有效利用闪存资源已成为企业存储系统中非常重要的问题。当今流行的技术之一是将Flash用作虚拟机环境中的二级主机端缓存。尽管这种方法可以为VM的IO工作负载提供IO加速，但它可能无法充分利用Flash的出色性能并证明Flash的每GB高成本是合理的。在本文中，我们在考虑性能和管理闪存资源的成本的同时，设计了新的VMware Flash资源管理器（vFRM和glb-vFRM）。具体而言，vFRM和glb-vFRM旨在在分别管理和操作专用企业工作负载和多个异构企业工作负载的Flash时，以最小的CPU，内存和IO成本来最大化Flash资源的利用率。我们新的闪存资源管理器采用热力学加热和冷却的思想来识别最能受益于放置在闪存中的数据块，并以惰性和异步模式在闪存和磁盘之间迁移数据块。对原型的实验评估表明，vFRM和glb-vFRM均比传统的缓存解决方案具有更好的成本效益，即，随着Flash大小的增加，IO命中率甚至比某些传统算法稍好，但IO带宽却减少了几个数量级。

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