ubuntu@aws:~/slow-mv$ strace -t mv 3GB.copy 3GB 19:00:09 execve("/bin/mv", ["mv", "3GB.copy", "3GB"], 0x7ffd0e7dddf8 /* 21 vars */) = 0 19:00:09 brk(NULL) = 0x55cd7d1ce000 19:00:09 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 19:00:09 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) ... 19:00:09 getgid() = 1000 19:00:09 access("3GB", W_OK) = 0 19:00:09 rename("3GB.copy", "3GB") = 0 19:00:18 lseek(0, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek) 19:00:18 close(0) = 0 19:00:18 close(1) = 0 19:00:18 close(2) = 0 19:00:18 exit_group(0) = ? 19:00:18 +++ exited with 0 +++ ubuntu@aws:~/slow-mv$