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Petal: Distributed Virtual Disks

机译：花瓣：分布式虚拟磁盘

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摘要

The ideal storage system is globally accessible, always available, provides unlimited performance and capacity for a large number of clients, and requires no management. This paper describes the design, implementation, and performance of Petal, a system that attempts to approximate this ideal in practice through a novel combination of features. Petal consists of a collection of network-connected servers that cooperatively manage a pool of physical disks. To a Petal client, this collection appears as a highly available block-level storage system that provides large abstract containers called virtual disks. A virtual disk is globally accessible to all Petal clients on the network. A client can create a virtual disk on demand to tap the entire capacity and performance of the underlying physical resources. Furthermore, additional resources, such as servers and disks, can be automatically incorporated into Petal. We have an initial Petal prototype consisting of four 225 MHz DEC 3000/700 workstations running Digital Unix and connected by a 155 Mbit/s ATM network. The prototype provides clients with virtual disks that tolerate and recover from disk, server, and network failures. Latency is comparable to a locally attached disk, and throughput scales with the number of servers. The prototype can achieve I/O rates of up to 3150 requests/sec and bandwidth up to 43.1 Mbytes/sec.
机译：理想的存储系统是可全局访问的，始终可用的，可为大量客户端提供无限的性能和容量，并且无需管理。本文介绍了Petal的设计，实现和性能，该系统试图通过新颖的功能组合在实践中逼近这一理想。花瓣由一组网络连接的服务器组成，这些服务器可协作管理物理磁盘池。对于Petal客户端，此集合显示为高度可用的块级存储系统，可提供称为虚拟磁盘的大型抽象容器。网络上所有Petal客户端均可全局访问虚拟磁盘。客户端可以根据需要创建虚拟磁盘，以利用基础物理资源的全部容量和性能。此外，可以将其他资源（例如服务器和磁盘）自动合并到Petal中。我们有一个最初的Petal原型，该原型由四个运行Unix并通过155 Mbit / s ATM网络连接的225 MHz DEC 3000/700工作站组成。该原型为客户端提供了可以容忍磁盘，服务器和网络故障并从中恢复的虚拟磁盘。延迟可与本地连接的磁盘相提并论，吞吐量随服务器数量而扩展。该原型可以实现高达3150个请求/秒的I / O速率和高达43.1 MB /秒的带宽。

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