Disk Spin Down power management settings

StephenB wrote:

maxblack wrote: And my point is that it appears noflushd is not doing spindown correctly, or at least it didn't with my drives. So my personal preference is to leave them spin, unless you can shut them down for 23 hours out of 24, as I'm doing with my NV+. A perfectly reasonable choice. Obviously correct operation is more important than the relatively small power savings (and many users also have gadgets that don't handle the spin-up delay well). I am doing something somewhat less conservative (spin down threshold of a couple hours). But I haven't seen your issue.

I was doing a bit of research myself on noflushd and came across this info and was wondering if this has anything to do with the problems people are having with spin down.

noflushd is a Linux daemon that monitors disk activity and spins down idle disks. It then blocks further writes to the disk to prevent it from spinning up again. Writes are cached and flushed to disk when the next read request triggers a spin-up.

KNOWN BUGS AND LIMITATIONS
Journaling filesystems like ext3, reiserfs or xfs bypass the kernel's delayed write mechanisms. This amounts to lousy spindown times when working off such a partition. There's no workaround for this.