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7.3.2.2. Advanced tuning for XFS

Before changing XFS parameters, you need to understand why the default XFS parameters are causing performance problems. This involves understanding what your application is doing, and how the file system is reacting to those operations.
Observable performance problems that can be corrected or reduced by tuning are generally caused by file fragmentation or resource contention in the file system. There are different ways to address these problems, and in some cases fixing the problem will require that the application, rather than the file system configuration, be modified.
If you have not been through this process previously, it is recommended that you engage your local Red Hat support engineer for advice.
7.3.2.2.1. Optimizing for a large number of files
XFS imposes an arbitrary limit on the number of files that a file system can hold. In general, this limit is high enough that it will never be hit. If you know that the default limit will be insufficient ahead of time, you can increase the percentage of file system space allowed for inodes with the mkfs.xfs command. If you encounter the file limit after file system creation (usually indicated by ENOSPC errors when attempting to create a file or directory even though free space is available), you can adjust the limit with the xfs_growfs command.