mount options? tflush: seconds sflush: segments timetillflush, segmentstillflush, idleflush?? -> best quota? ------------ what does a checkpoint do? write to superblocks: ifile inode block # cycle through superblocks. umount flushes current sb to all sbs. ------- segment roll-forward stops when: "next" segment has: - failed CRC - older data than previous segment how do I get current time? how do I calculate CRC?