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Date:	Wed, 30 Sep 2009 11:58:43 +0200
From:	Berthold Gunreben <b.gunreben@....de>
To:	Tejun Heo <htejun@...il.com>
Cc:	"linux.kernel" <linux-kernel@...r.kernel.org>,
	Theodore Tso <tytso@....edu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Niel Lambrechts <niel.lambrechts@...il.com>
Subject: Re: 2.6.29 regression: ATA bus errors on resume

Hi Tejun,

thanks a lot for your reply.

Am Freitag 25 September 2009 schrieb Tejun Heo:
> Hello, Berthold.
>
> The disk is most likely losing power briefly.  After boot, run
> "smartctl -a" on the device and record the output.  After triggering
> the problem, do it again.  See if Start_Stop_Count, Power_Cycle_Count
> or Power-Off_Retract_Count has increased.  If so, take out your PSU,
> bury it half-deep in your backyard, apply some gasoline, light it up
> and enjoy the sight of perishing evil with a can of beer.

You might be right. However, I cannot reproduce the problem anymore, since I 
switched to the totally unsupported JFS as filesystem.

In the meantime, I was able to copy 1.5TB of data back to the array, and the 
system also survived artificially generated high load. If the problem is a 
race (which I do not know), it might still be there. Obviously, it does not 
show up as often again.

It could still be the power supply of course, but I don't understand why a new 
kernel would trigger power outages so often (current kernels triggered the 
problem latest after 5 minutes). Maybe it has something to do with the 
chipset (ICH7R) which is capable of hot remove/add disks. Or it is related to 
the hotswap harddisk slots in the case 
(http://www.chenbro.eu/corporatesite/products_detail.php?sku=79 ). I have no 
idea....

Thanks

Berthold

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