To meet the increasingly demand of massive storage system, we have designed and implemented a parallel file system called Cappella. It consists of Client, Object Storage Server (OSS) and Metadata Server (MDS). Its I/O performance and data reliability mostly rely on the OSS. In this paper, we present the design and implementation of the OSS. By comparing with existing OSS implementation, our OSS can easily achieve high performance and high reliability by an operation abstraction layer.
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