Description
Removable-device write caching can be tuned by udev rules and a helper that adjusts dirty page settings for devices. usb-dirty-pages-udev is for systems trying to cache more writes in RAM before flushing to removable storage.
Tune carefully and understand power-loss risk. Larger dirty-page windows can improve bursts but may delay writes, increase data loss on unplug or crash, and make progress indicators misleading.