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#1 2009-08-13 13:31:11

ogronom
Member
From: Toronto, Canada
Registered: 2008-05-06
Posts: 123

Hard drive spin down problem again: testing needed

Hi guys,

Here is how a well known "spin down" problem is presented in our wiki.http://wiki.archlinux.org/index.php/Lap … wn_problem

Suggested solution is easy turn off APM with hdparm -B 255 device or make it least active with hdparm -B 254 device. Drawbacks of this solution:

1. Consumes lots of power.
2. HDD becomes a heated iron at high io.

After playing around with parameters I came to

hdparm -B 128 -S 60 device

With these parameters I can't HEAR any clicking and the temperature of the disk is not so high. But as usuall it doesn't mean anything, and now I just started to gather statistics for this regime.

Statistics for a previous regime (-B 254) was

 Power_On_Hours:          5136 -  3393          = 1743
 Load_Cycle_Count :       145093 -  136541      = 8552
 Load_Cycle_Count / Power_On_Hours:               4.906

I think one week would be enough for an estimation of  the increasing rate of Load_Cycle_Count. Is anyone else interested in a similar testing or may be already did one? I think that the wiki page should be modified with more optimal settings (if they are).

Last edited by ogronom (2009-08-13 13:31:39)

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#2 2009-08-13 19:59:14

R00KIE
Forum Fellow
From: Between a computer and a chair
Registered: 2008-09-14
Posts: 4,734

Re: Hard drive spin down problem again: testing needed

Setting the advanced power management to 128 _should_ stop the disk from parking but an idle timeout of 5 minutes may be too low unless you are on battery and need to save as much as you can.


R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

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#3 2009-08-13 20:43:02

ogronom
Member
From: Toronto, Canada
Registered: 2008-05-06
Posts: 123

Re: Hard drive spin down problem again: testing needed

Ok, maybe. What is the reasonable setting of timeout? (at least what are your settings)
My current rate is 3.25 (which is lower than was before), but again it is too early to talk about reliable information.

I don't care so much about power consumption (my current 3.5 hours is enough for my needs). Temperature was "killing" me.

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