[ltp] tuning with hdparm

[Peter Frühberger]

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Rémi Lambert wrote:
> Hello !
> 
> I've an X31 and the hard disk sometimes produce an energic sound, like 
> pronouncing "Tac". Is this the same sound you got when your disk was 
> "rattling" (I don't know what it means, "rattling"...).
> 
> The output of the 
>  hdparm /dev/hda1
> is 
>  multicount = 16 (on)
>  IO_support =  0 (default 16-bit)
>  unmaskirq =  0 (off)
>  using_dma = 1 (on)
>  keepsettings = 0 (off)
>  ...
>  geometry = 65535/16/63, sectors = 20487537, start = 63
> 
> and the output of 
>  hdparm -tT /dev/hda1
> is
>  Timing buffer-cache reads : 704.70 MB/sec
>  Timing buffered disk reads : 28.32 MB/sec
> 
> 
> Why does the IO_support disabled ? Should I enable it (with the -c1 our -c3 
> flag ?) ?    Is it dangerous ?
> 
> 
> Should I try 
>  hdparm -qc1qu1qd1 -B254   
> ?? Is it dangerous ? :-)
> 
> 
> So, the main question in this mail is :
> "is it dangerous for my hard disk to try those two hdparm commands ?"
> :-)
> 
> 
> 
> Thank you very much !
> 
> RL
> 
> Le Jeudi 2 Septembre 2004 15:26, Szakacsits Szabolcs a écrit :
> 
>>On Thu, 2 Sep 2004, Alexander Gran wrote:
>>
>>>At least hdparm -qc1qu1qd1 should be ok. -m? -B ? should be tested,
>>>but could help.
>>
>>I must use -B254 otherwise the disk (T40, 40G) makes very irritating
>>rattling (this is already the second one, the original one crashed and
>>made exactly the same noise). One of the side-effects was 1-2 MB/sec
>>speed increase.
>>
>> Szaka

If you use an hitachi drive, then this isn`t a bug, it`s a feature. I
had a telephone call with the hitachi people, it is called something
like "low power" idle.

You can try hdparm -B 192 /dev/hda this should normaly disable this
feature and sets your drive into active idle.

I can provide you the hitachi mails, if you want to have them.

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