Using LVM writecache for faster write performance
summary
Shows how LVM’s new dm-writecache feature routes all writes first to a fast device (PMEM or SSD) to reduce commit latency, and contrasts it with the existing dm-cache ‘hot spot’ approach that selectively caches frequently used blocks for reads and writes. Explains differences between dm-writecache and dm-cache and demonstrates how to configure both caches using LVM; assumes familiarity with basic LVM terminology and usage.
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