From: Jens Axboe <axboe@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Marcin Owsiany <marcin@owsiany.pl>, linux-kernel@vger.kernel.org
Subject: Re: SCSI "asking for cache data failed"
Date: Thu, 13 Oct 2005 14:30:29 +0200 [thread overview]
Message-ID: <20051013123028.GE6603@suse.de> (raw)
In-Reply-To: <1129208154.18635.4.camel@localhost.localdomain>
On Thu, Oct 13 2005, Alan Cox wrote:
> On Iau, 2005-10-13 at 12:45 +0200, Marcin Owsiany wrote:
> > I'm wondering about the following messages, which appeared when I upgraded from
> > 2.4 to 2.6:
> >
> > | sda: asking for cache data failed
> > | sda: assuming drive cache: write through
> >
> > (a larger log snippet below)
>
> The kernel asks the SCSI drive for its cache parameters. The AMI raid
> card sitting in the middle doesn't know how to handle this so this
> message occurs. It should be ok providing the raid card itself is
> handling the consistency correctly but check with your card vendor.
The assumption that sd makes might be a little on the risky side though,
would seem a lot safer to assume write back if you don't know the
policy. At least that wont bring surprises later on...
--
Jens Axboe
next prev parent reply other threads:[~2005-10-13 12:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-13 10:45 Marcin Owsiany
2005-10-13 12:55 ` Alan Cox
2005-10-13 12:30 ` Jens Axboe [this message]
2005-10-13 18:30 ` Marcin Owsiany
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