Hard disk woes

Michael Abbott michael at araneidae.co.uk
Mon Sep 5 11:56:22 PDT 2005


On Mon, 5 Sep 2005, Jason Morgan wrote:
> On Mon, Sep 05, 2005 at 03:16:13PM +0000, Michael Abbott wrote:
>> I'm having some very odd behaviour from one of my hard disks and I wonder
>> what anybody makes of it.
>>
>> In brief, the hard disk in questions works just fine much of the time, but
>> when high volume data transfers are requested I get the following in
>> /var/log/messages:
>>
>> Sep  3 15:21:02 saturn /kernel: ad6: READ command timeout tag=0 serv=0 -
>> resetting

> I had a very similar problem a while back. After replacing the drive in 
> question, then replacing the motherboard, I discovered it was a power 
> issue. The power supply was freaking out at medium to high loads, which 
> was causing the device to continually reset.

Well, I hope that's not it.  I'm encouraged to think not:
 	- the problem seems to be tied to one particular hard disk and I
 	  presently run with four hard disks
 	- the system has operated trouble free for three years
 	- my memory is that it was a good quality power supply.
I don't really see how I'd diagnose a power supply problem, but as I say, 
the hard disk in question is the only part with problems.


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