D.cscan.o

d.cscan.o is an object file ( .o file) that contains the compiled code for the DIO and AIO scan functionality. It is a part of the Linux kernel's block layer, responsible for managing I/O operations between the kernel and block devices (e.g., hard drives, SSDs).

First-Come-First-Served (FCFS) is the simplest scheduling algorithm but performs poorly under load. If requests are scattered randomly across the disk platter, the disk arm engages in "thrashing"—moving erratically from inner to outer cylinders with no regard for distance. d.cscan.o