linux-kernel - Re: SATA exceptions

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Message-ID: <4696EDAB.10404@gmail.com>
Date:	Fri, 13 Jul 2007 12:12:43 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	caglar@...dus.org.tr, Robert Hancock <hancockr@...w.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: SATA exceptions

Pavel Machek wrote:
>>>> Your SMART log shows 309 reallocated sectors. That seems somewhat high..
>>> Ah sorry to misinterpret the content:), its a quiet new piece of hardware (at 
>>> most ~1.5 month old) and  "Reallocated_Event_Count" constantly increases 
>>> (currently its increased to 313) and although i'm not 100 percent sure these 
>>> errors only occured with kernels > 2.6.18 (or 2.6.18 didn't report these 
>>> cause according to kern.log these only visible with 2.6.22+) 
>> OS and driver can't really do much about the reallocation event.  Some
>> number of reallocations is okay but if you it going up constantly, you
>> probably have a dying disk.
> 
> Hmm... cut the power while writing is doable from OS and might force
> reallocations?

Hmmm... We don't have any pending write when power goes out and I don't
emergency unload can directly increase reallocation count.  It can
shorten lifespan of the head tho.

> You might want to check if number of reallocated sectors increases
> with shutdowns/reboots.

I'm curious too.

-- 
tejun
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