However, if the NFS server crashes before the I/O request gets to disk, you could lose data. This can save time for I/O requests and improve performance. Many people prefer this option because they have little chance of losing data if the NFS server goes down or network connectivity is lost.Īsynchronous mode allows the server to reply to the NFS client as soon as it has processed the I/O request and sent it to the local filesystem that is, it does not wait for the data to be written to stable storage before responding to the NFS client. For synchronous writes, the server replies to NFS clients only when the data has been written to stable storage. Most people use the synchronous option on the NFS server. In the sections that follow, these options are presented and discussed. The options for these three categories are listed below. In this article, I've broken the list of tuning options into three groups: (1) NFS performance tuning options, (2) system tuning options, and (3) NFS management/policy options. You can also tune both the NFS client and server TCP stacks. NFS tuning can occur on both server and clients. It's not an extensive list by any stretch of the imagination, but the options are typical for NFS. In addition to tuning for performance, I will present a few useful options for managing and securing NFS. In this article, I'll go over some of the major options illustrating some of the pluses and minuses. However, you can at least identify options for improving NFS performance.
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Tuning for performance is a loaded question because performance is defined by so many different variables, the most important of which is how to measure performance. One of the most common questions about NFS configuration is how to tune it for performance and management and what options are typically use d. You can even use it for larger clusters if your applications do not use it for I/O (e.g., /home). It is very easy to set up and performs reasonably well for small to medium clusters as primary storage. NFS is the most widely used HPC filesystem.
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