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Date:      Tue, 24 Jul 2012 13:04:21 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        dweimer@dweimer.net
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: Disk Errors
Message-ID:  <20120724180421.GF38393@dan.emsphone.com>
In-Reply-To: <d65bfc394e4b31d92bb6ab9e8d220d16@dweimer.net>
References:  <d65bfc394e4b31d92bb6ab9e8d220d16@dweimer.net>

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In the last episode (Jul 24), dweimer said:
> I have three 1TB disks I use for backup, two of them are Western Digital
> drives I bought specifically for this purpose.  One is a Seagate drive
> that came out of a barebones PC that I replaced with a couple smaller
> drives in a stripe to gain performance.  I use the drives in an external
> SATA dock, using geom eli encryption, the western digital drives give me
> no problems, but the seagate drive gives me a lot of the following errors
> under load.
> 
> ad4: TIMEOUT - WRITE_DMA48 retrying (1 retry left) LBA=817755328
> ad4: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request) LBA=837397120
> ad4: TIMEOUT - WRITE_DMA48 retrying (1 retry left) LBA=879786112
> ad4: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request) LBA=882931200
> ad4: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request) LBA=890542016
> ad4: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request) LBA=902767296
> ad4: TIMEOUT - WRITE_DMA48 retrying (1 retry left) LBA=904071296

If you install the sysutils/smartmontools port, you can run "smartctl -x
/dev/ad4" to dump the drive's SMART attribute table and error logs.  Those
should give you an indication of whether the drive is going bad.  If the
drive is logging those write errors in its internal log, then you know it's
not a cabling issue.  If it's not logging errors, I suppose you might have a
loose SATA plug on the drive itself, which would explain why the problem
follows the drive around.

> dmesg info about the drive at connection time:
> ad4: 953869MB <Seagate ST31000528AS CC46> at ata2-master UDMA100 SATA 
> 3Gb/s
> 
> dmesg info about one of the western digital drives:
> ad4: 953869MB <WDC WD10EARS-00Y5B1 80.00A80> at ata2-master UDMA100 
> SATA 3Gb/s
> 
> Before I scrap the drive I just wanted to see if anyone could either 
> say for sure its hardware, or if something else could possibly cause 
> this.  I don't suspect the controller, cable or dock as the problems 
> would likely occur with the western Digital drives as well if one of 
> them were involved.

-- 
	Dan Nelson
	dnelson@allantgroup.com



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