Cold data utilization drops very slowly, so it ties up free blocks longer. Use the age of segments to predict stability of the segments. In FFS, needs to scan the whole disk to reconstruct metadata. LFS writes checkpoint periodically to maintain a consistent and complete picture of the FS in the log. Although LFS concentrates on speeding up small writes, it also works well in large file accesses.
Recovery time is in seconds, instead of minutes to hours compared to traditional file systems.