linux-kernel - Re: ATA device reset, shoud I be concerned?

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Message-Id: <20080115025435.1e21b703.akpm@linux-foundation.org>
Date:	Tue, 15 Jan 2008 02:54:35 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Georgi Chulkov <g.chulkov@...obs-university.de>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: ATA device reset, shoud I be concerned?

On Mon, 14 Jan 2008 00:19:20 +0200 Georgi Chulkov <g.chulkov@...obs-university.de> wrote:

> Hello,
> 
> During heavy disk load on my laptop, sometimes the IDE disk will pause for a 
> second and then continue. I get this in my kernel log:
> 
> [ 9031.028000] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 
> frozen
> [ 9031.028000] ata1.00: cmd c8/00:08:90:ca:ce/00:00:00:00:00/e0 tag 0 cdb 0x0 
> data 4096 in
> [ 9031.028000]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
> (timeout)
> [ 9036.068000] ata1: port is slow to respond, please be patient (Status 0xd0)
> [ 9041.052000] ata1: device not ready (errno=-16), forcing hardreset
> [ 9041.052000] ata1: soft resetting port
> [ 9041.232000] ata1.00: configured for UDMA/100
> [ 9041.232000] ata1: EH complete
> [ 9041.248000] sd 0:0:0:0: [sda] 78140160 512-byte hardware sectors (40008 MB)
> [ 9041.248000] sd 0:0:0:0: [sda] Write Protect is off
> [ 9041.248000] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
> [ 9041.248000] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, 
> doesn't support DPO or FUA
> 
> My question: What is this telling me, and do I need to be concerned? 
> Everything continues to work normally after the message: no I/O errors, no 
> fsck errors, etc.
> 
> I've seen some similar reports on the mailing list, but they include slightly 
> different messages. I would appreciate any information!
> 
> uname -a (on Kubuntu Gutsy, CPU is a single-core 32-bit Pentium M):
> 
> Linux superfly 2.6.22-14-386 #1 Tue Dec 18 07:34:24 UTC 2007 i686 GNU/Linux
> 

Has it done this in all kernel versions or did some earler version work OK?
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