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Date:      Mon, 02 Apr 2001 18:53:10 -0700
From:      Kent Stewart <kstewart@urx.com>
To:        Boris Staeblow <balu@dva.in-berlin.de>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: FUJITSU MPG3409AT didn't work reliable in 4.3-RC!
Message-ID:  <3AC92D06.7DA24901@urx.com>
References:  <20010403023412.A54627@dva.in-berlin.de>

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Boris Staeblow wrote:
> 
> Hello,
> 
> I can't get my system working stable _until_ I define
> ATA_ENABLE_WC in my kernel-config!
> 
> I get this message _many_ times when I write to my Fujitsu 40GB-Harddisk:
> 
> /kernel: ata3: resetting devices .. done
> /kernel: ad6: WRITE command timeout tag=0 serv=0 - resetting
> 
> There are not only those annoying messages but also there are very long
> access delays (5-10 secs!). During these delays the disk-access LED
> stays red and there is absolutely no response from the
> _entire_ disk I/O-system.
> 
> Turning off WC by default may break the stability of
> some harddrives!
> 
> Anyone out there who can verify that with a FUJITSU "MPG3409AT E"?
> 
> IMO this behavior should be clarified before 4.3-Release!

Other than your drive doesn't appear to support it, do you have
softupdates turned on? Write caching and softupdates are not compatible
from what I followed on -hackers during the development.

Kent

> 
> Boris
> 
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-- 
Kent Stewart
Richland, WA

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