面向nvmm的分层持久客户端Lustre缓存

Wen Cheng, Chunyan Li, Lingfang Zeng, Y. Qian, Xi Li, A. Brinkmann
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引用次数: 6

摘要

在高性能计算(HPC)中,数据和元数据存储在专门的服务器节点上,客户端应用程序通过网络访问服务器的数据和元数据,这会导致网络延迟和资源争用。这些服务器节点通常配备(慢速)磁盘,而客户机节点将临时数据存储在快速ssd甚至非易失性主存储器(NVMM)上。因此,只有在整个存储体系结构中包含快速客户端存储设备时,才能充分发挥并行文件系统的潜力。在本文中,我们为Lustre文件系统(简称NVMM-LPCC)提出了一个基于nvmm的分层持久客户机缓存。NVMM-LPCC实现两种缓存模式:读写模式(简称RW-NVMM-LPCC)和只读模式(简称RO-NVMM-LPCC)。NVMM-LPCC集成了Lustre分层存储管理(HSM)解决方案和Lustre布局锁机制,为运行在客户端节点上的I/O应用程序提供一致的持久缓存服务,同时维护整个Lustre文件系统的全局统一命名空间。本文给出的评估结果表明,与原生Lustre系统相比,NVMM-LPCC的平均读吞吐量提高了35.80倍,平均写吞吐量提高了9.83倍,同时具有良好的可扩展性。
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NVMM-Oriented Hierarchical Persistent Client Caching for Lustre
In high-performance computing (HPC), data and metadata are stored on special server nodes and client applications access the servers’ data and metadata through a network, which induces network latencies and resource contention. These server nodes are typically equipped with (slow) magnetic disks, while the client nodes store temporary data on fast SSDs or even on non-volatile main memory (NVMM). Therefore, the full potential of parallel file systems can only be reached if fast client side storage devices are included into the overall storage architecture. In this article, we propose an NVMM-based hierarchical persistent client cache for the Lustre file system (NVMM-LPCC for short). NVMM-LPCC implements two caching modes: a read and write mode (RW-NVMM-LPCC for short) and a read only mode (RO-NVMM-LPCC for short). NVMM-LPCC integrates with the Lustre Hierarchical Storage Management (HSM) solution and the Lustre layout lock mechanism to provide consistent persistent caching services for I/O applications running on client nodes, meanwhile maintaining a global unified namespace of the entire Lustre file system. The evaluation results presented in this article show that NVMM-LPCC can increase the average read throughput by up to 35.80 times and the average write throughput by up to 9.83 times compared with the native Lustre system, while providing excellent scalability.
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