Debugging Slow Buffered Reads on the Lustre File System

"Buffered read performance under Lustre has been inexplicably slow when compared to writes or even direct IO reads. A balanced FDR-based Object Storage Server can easily saturate the network or backend disk storage using o_direct based IO. However, buffered IO reads remain at 80% of write bandwidth. In this presentation we will characterize the problem, discuss how it was debugged and proposed resolution. The format will be a presentation followed by Q&A."

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