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6.11. Realtime Allocator

Certain classes of applications require deterministic latencies on file allocation operations
The realtime allocator uses a bitmap algorithm that gives consistent allocation latencies regardless of the filesystem's contents.
By using the realtime allocator in conjunction with an external log volume, it's possible to remove most of the unpredictability in disk response times that's caused by metadata overheads.

Note

The realtime allocator is only available when XFS kernelspace is built with CONFIG_XFS_RT enabled