----- Original Message -----
From: "Tejun Heo" <tj@xxxxxxxxxx>
To: "Janos Haar" <djani22@xxxxxxxxxxxx>
Cc: <linux-ide@xxxxxxxxxxxxxxx>
Sent: Friday, August 01, 2008 6:29 AM
Subject: Re: possible data corruption on ICH8 or WD raptor
Janos Haar wrote:
Hello list,
I have one (planned) production ready server with DP35DP Intel
motherboard, and 6 drive.
2x 500GB WD SATA (not interesting)
4x 300GB WD Velociraptor, SATA2
When i have tested the server i see one error report on the dmesg:
ata3.00: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xa frozen
ata3.00: irq_stat 0x00400040, connection status changed
ata3: SError: { PHYRdyChg DevExch }
ata3.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
res 40/00:20:40:de:90/00:00:07:00:00/40 Emask 0x10 (ATA bus
error)
You're getting PHY event on flush which is a pretty strong indication
that you're having power problem. The disk goes out to transfer data in
its buffer to the platter and draws more power from the cable. For some
reason, power is not maintained properly. Disk checks out momentarily
causing the PHY event and losing the data in its buffer. Try to connect
the harddrive to a separate PSU and see whether the problem goes away.
Hello,
Thank you for the answer.
Now, this server is a productive syetem, and runs an important application.
The problem generally exists, but looks like comes only when i am testing
the transfer with big files.
(the application does not do that)
About the power:
This PC have one 650W Chieftech PS, 1 quad core cpu, and 6 hdd.
I have previously measured the power current on the line, and the PC uses
only 100-120W on peak.
The problem only comes on the 4 raptor hdd, and this drive only uses each
6W. (from the documentation).
It is hard to try separate PS or something hw solution.
Additionally, generally i think it is not power issue, i am 90% sure.
Are you sure this can not be software issue?
If you say yes, i will go into the server room, and will try another ps
anyway....
more info:
The PC have 8GB ram, and memtest runs previously 4 day continously, without
error.
Thanks,
Janos Haar
--
tejun
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