Message-ID: <49079E09.20703@shaw.ca>
Date: Tue, 28 Oct 2008 17:19:37 -0600
From: Robert Hancock <hancockr@shaw.ca>
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To: Oskar Liljeblad <oskar@osk.mine.nu>
CC: linux-kernel@vger.kernel.org
Subject: Re: sata errors with Seagate 1.5TB on AMD 780G/SB700 motherboard
References: <fa.01zEaARwrup2dCOTuHTYxzuS9BI@ifi.uio.no>
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Oskar Liljeblad wrote:
> Can anyone make any sense of these SATA errors? They're killing my md RAID5
> (at least the second error did).
> 
> Hard drives (ata1/sda, ata2/sdb, ata3/sdc): Seagate ST31500341AS 1.5TB SATA
> Motherboard: Asus M3A78-EH with AMD 780G/SB700 chipset
> SATA driver: ahci
> 00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [AHCI mode]
> 
> Smart reports no errors on the drives, short & long tests have been run as
> well. The system is brand new.
> 
> I've read some reports about SATA 3.0 Gbps vs 1.5 Gbps problems and I'm
> considering limiting the drives to 1.5 Gbps using jumpers. Would that be a
> good idea?
> 
> 19:24:26 ata2: exception Emask 0x50 SAct 0x0 SErr 0x90a02 action 0xe frozen
> 19:24:26 ata2: irq_stat 0x00400000, PHY RDY changed
> 19:24:26 ata2: SError: { RecovComm Persist HostInt PHYRdyChg 10B8B }

RecovComm: Communications between device and host temporarily lost, but 
regained
Persist: Persistent communication or data integrity error
HostInt: Host bus adapter internal error
PHYRdyChg: PhyRdy signal changed state
10B8B: 10b to 8b decoding error occurred

Sounds like the drive and the controller are unhappy with each other, or 
there's some kind of communications or hardware problem. Not likely a 
kernel issue.

It's unclear if limiting to 1.5 Gbps would help, you could try it and see..
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