Date: Fri, 28 Oct 2005 11:12:37 -0700 From: Jin Guojun <jinmtb@sbcglobal.net> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: Peter Jeremy <PeterJeremy@optushome.com.au>, hackers@freebsd.org, hardware@freebsd.org, sos@freebsd.org Subject: Re: Very slow writing to SATA disk Message-ID: <43626A15.7040002@sbcglobal.net> In-Reply-To: <200510281245.28314.mi%2Bmx@aldan.algebra.com> References: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net> <20051028094844.GU39882@cirb503493.alcatel.com.au> <200510281245.28314.mi%2Bmx@aldan.algebra.com>
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Mikhail Teterin wrote: >>>idle temperature seems to be 54C. >>> >>> > According to smartctl, the drive runs at 56C during the copying. Its > > > > >>I'd double-check that (eg with a finger). If the drive really is >>running at 56°C, it won't last very long. >> >> > >It sure feels hot to the touch, but nothing is burning, of course (freshly >poured tee is near 100C and never ignites the paper cup). > >Do you think, the high temperature explains the poor write performance? The >drive still reads at tens of Mb per second... According to > >http://www.spacecentersystems.com/catalog/product_info.php/products_id/293088 > >this model's 'Ambient Temperature' spec is 5 to 55C... > > Generally, the temperature is not directly affecting the performance till the mechanical problem occurred due to the temperature. A few types of hard drives are manufactured with higher temperature spec., however, those drives are usually broken in 3-6 months (continuously run). Otherwise, the higher temperature is due to some mechanical problem which may slow down the performance. In your case, it seems to me that your drive temperature is at or above the upper bound that could indicate a mechanical problem. Check to see if the reading speed of this drive is normal, then, this won't be the case for now. But keep in mind, if this drive always operates at this temperature, it will not last long. The better temperature for electronic components is below 39C, and not more than 45C~50C. So, 56C can gradually damage the mechanical as well as the electronic components. -Jin
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