From owner-freebsd-hackers@FreeBSD.ORG  Fri Oct 28 21:35:19 2005
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From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@FreeBSD.ORG>
Date: Fri, 28 Oct 2005 23:35:02 +0200
To: Peter Jeremy <PeterJeremy@optushome.com.au>
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Cc: Mikhail Teterin <mi+mx@aldan.algebra.com>, hackers@FreeBSD.ORG,
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Subject: Re: Very slow writing to SATA disk
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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 =20
>> else to look
>> at?
> That exhausts my ideas, sorry.  S=F6ren might be able to suggest =20
> something.

Not really, however I have no experience with Hitachi drives, I =20
havn't trusted that line of drives since their name was IBM Deathstar =20=

DTLA series :/

>>>> According to smartctl, the drive runs at 56C during the copying. =20=

>>>> 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=B0C (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 =20
drive is choking on it and barely is able to compensate..
What does SMART say ? any unusual like high correction rates or =20
anything ?

S=F8ren Schmidt
sos@FreeBSD.org