Re: logging writes to disk (keeping disk from spinning down)
On Mon, 02 Mar 2009 01:41:38 -0600
Ron Johnson <ron.l.johnson@cox.net> wrote:
> On 02/28/2009 11:14 AM, green wrote:
> > On Sat, 2009-02-28, 059, Bob Cox wrote:
> >> On Sat, Feb 28, 2009 at 08:21:16 +0000, Bob Cox
> >> (debian-user@lists.bobcox.com) wrote:
> >>> You may need noflushd (no flush daemon) to do
> >>> what you want.
> >>>
> >>> aptitude show noflushd
> >> Which is for IDE drives and you are using SATA. Ignore that suggestion
> >> then!
> >
> > I did notice that and so discounted it immediately, but why would ext3 need
> > to do a write to journal every 5 seconds anyway when _nothing_ is being
> > written to the filesystem? In that case a write only makes sense when the
> > filesystem is unmounted.
> >
> > If something is in fact writing to the filesystem, then I need to find out
> > what.
>
You can abuse laptop mode and do
echo 1 > /proc/sys/vm/block_dump
and then look in the syslog I think. You may need to also enable laptop mode
for this to work (at least used to be the case)
echo 1 > /proc/sys/vm/laptop_mode
> Having members of a RAID set go to sleep independently of control by
> md seems kinda scary.
>
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