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Allocator Hints for Btrfs
Allocator hints in Btrfs allow prioritisation of devices for data and metadata, improving performance and flexibility.
The galaxy's distinctive glowing core from visible light is replaced by a smooth inner disk in this view, while its outer ring reveals intricate clumps of dust. The idea is to optimise mixed-device setups, such as SSDs and HDDs in a single filesystem by using faster disks for the latency sensitive metadata, while storing the bulk data on slower devices. Types 2 and 3 enforce an exclusive allocation, restricting data or metadata entirely to the specified device, which can lead to early no-space ( ENOSPC) errors.
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