Hi Matt,
thanks for the answer.
Since spindown was working properly with debian etch
the noatime mount option was already set.
So I still guess something with hddtemp is now built
into the kernel?
If I send the hdd to spindown with
/usr/bin/sg_start 0 /dev/sda
it wakes up after about 4 or 5 minutes and I need
to check out which process might be responsible for that.
Can give me anyone a hint what I have to check?
Markus
Matthew Palmer schrieb:
On Sat, Jan 24, 2009 at 09:57:29PM +0100, Markus Ulbricht wrote:
Hi all!
Since hdd performance of the Thecus N2100 is not so
perfect with debian etch (stable, kernel 2.6.18) I did
an upgrade to lenny with kernel 2.6.26 including the
DMA patches by Martin Michlmayr.
Thanks to Martin the hard drive performance is now
much better (173 MB/s cached / 48 MB/s buffered reads).
Unfortunately hdd spindown is no longer working.
Oooh, I've been here. My problem turned out to be atime updating; I had a
process that was reading a file every 30 seconds or so, which then caused
the atime on that file to be updated and hence the disk was never spinning
down. Remounting with noatime did the trick.
Assuming that isn't it, it's unlikely that you'll be running enough
processes to make finding the culprit by killing things one-by-one
impractical.
Since I am not so familiar with kernel (re)compilation I am not able
to create an appropriate kernel needed for tools like atop which is able
to report processes responsible for disk i/o.
Rebuilding a kernel isn't hard, but it does take a little while, so I'd go
with other investigation methods first.
- Matt
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