Very slow writing to SATA disk

[Søren Schmidt]

On 28/10/2005, at 22:48, Peter Jeremy wrote:

> On Fri, 2005-Oct-28 12:45:27 -0400, Mikhail Teterin wrote:
>
>> No, just checked -- the hw.ata.wc is set to 1. Is there anything  
>> else to look
>> at?
> That exhausts my ideas, sorry.  Sören might be able to suggest  
> something.

Not really, however I have no experience with Hitachi drives, I  
havn't trusted that line of drives since their name was IBM Deathstar  
DTLA series :/

>>>> According to smartctl, the drive runs at 56C during the copying.  
>>>> Its
>>>> idle temperature seems to be 54C.
>>>>
>> It sure feels hot to the touch, but nothing is burning,
>
> A rule-of-thumb is that you can hold your finger on something for 4
> seconds then it is 45°C (or less).
>
>> this model's 'Ambient Temperature' spec is 5 to 55C...
>
> It's unlikely to affect I/O performance (though it may increase the
> number of thermal re-calibrations) but it will definitely shorten the
> drive life.

Indeed, 55C is way to high for 24/7 usage, and it might be that the  
drive is choking on it and barely is able to compensate..
What does SMART say ? any unusual like high correction rates or  
anything ?

Søren Schmidt
sos at FreeBSD.org